1 00:00:11,578 --> 00:00:14,580 No-one, and I mean no-one has ever been 2 00:00:14,614 --> 00:00:16,315 near the bottom of this trench. 3 00:00:16,383 --> 00:00:18,317 We don't know what's down there. 4 00:00:18,351 --> 00:00:20,586 [Alan] I've never seen anything like that. 5 00:00:20,620 --> 00:00:23,255 [Rob] The sea temperature's extremely warm. 6 00:00:23,289 --> 00:00:24,490 One of the first symptoms 7 00:00:24,557 --> 00:00:26,358 of heatstroke is people acting irrationally. 8 00:00:26,393 --> 00:00:29,428 Hey, I'm going as fast as I [bleep] can. 9 00:00:29,462 --> 00:00:31,096 He can't make it. 10 00:00:31,131 --> 00:00:33,365 [Victor] Nothing on the sonar. [bleep] 11 00:00:35,802 --> 00:00:37,102 [Alan] Watch yourself, watch yourself. 12 00:00:37,137 --> 00:00:39,204 [bleep] Pull up, pull up, pull up! 13 00:00:43,977 --> 00:00:45,577 [Demetri] Humankind has explored 14 00:00:45,612 --> 00:00:48,714 every continent on Earth. 15 00:00:48,748 --> 00:00:51,183 We've climbed its tallest mountains. 16 00:00:52,685 --> 00:00:55,854 And even journeyed into space. 17 00:00:55,889 --> 00:00:57,423 [man] "Thank you, Mr. President." 18 00:00:57,457 --> 00:00:58,791 [Demetri] But there's a vast swathe 19 00:00:58,825 --> 00:01:00,092 of our own planet 20 00:01:00,126 --> 00:01:02,227 that has remained a mystery. 21 00:01:06,933 --> 00:01:09,034 The deep ocean. 22 00:01:09,069 --> 00:01:11,737 Stretching down over 35,000 feet 23 00:01:11,771 --> 00:01:13,572 into crushing pressures, 24 00:01:13,606 --> 00:01:16,508 it's been near impossible to reach. 25 00:01:16,543 --> 00:01:17,876 Until now. 26 00:01:19,879 --> 00:01:22,948 New engineering breakthroughs are driving an audacious 27 00:01:22,982 --> 00:01:25,918 global mission to dive to the deepest points 28 00:01:25,985 --> 00:01:27,586 of all the five oceans 29 00:01:27,620 --> 00:01:30,456 for the first time in history. 30 00:01:30,490 --> 00:01:32,624 These pioneers will push technology 31 00:01:32,659 --> 00:01:33,759 to the limit. 32 00:01:33,793 --> 00:01:36,829 - What the hell was that? - We have leaking hatch. 33 00:01:36,863 --> 00:01:38,931 [Demetri] To open up this final frontier 34 00:01:38,965 --> 00:01:40,699 as never before. 35 00:01:40,733 --> 00:01:43,068 [woman] Trying to mentally put yourself at the bottom 36 00:01:43,103 --> 00:01:44,837 is just mind-blowing. 37 00:01:44,871 --> 00:01:46,905 [Demetri] Mapping hidden landscapes, 38 00:01:46,940 --> 00:01:49,408 discovering unknown lifeforms. 39 00:01:49,442 --> 00:01:52,144 [Alan] What on earth is that? 40 00:01:52,178 --> 00:01:53,479 [Demetri] And unlocking the secrets 41 00:01:53,513 --> 00:01:56,081 of how life in the extreme deep ocean 42 00:01:56,116 --> 00:01:58,117 affects our entire planet. 43 00:01:58,151 --> 00:02:01,220 [dramatic music playing] 44 00:02:12,098 --> 00:02:14,299 [Demetri] Millionaire explorer Victor Vescovo 45 00:02:14,334 --> 00:02:17,369 has spent the last four years preparing and planning 46 00:02:17,403 --> 00:02:20,405 to make exploration history. 47 00:02:20,440 --> 00:02:24,510 I've been doing somewhat risky things all my life. 48 00:02:24,544 --> 00:02:26,311 Coming up with a mission that's never been done before 49 00:02:26,346 --> 00:02:28,514 is extremely exciting and difficult 50 00:02:28,548 --> 00:02:31,483 and seeing it through to its conclusion. 51 00:02:31,551 --> 00:02:33,519 [Demetri] Victor has set himself the goal of being 52 00:02:33,553 --> 00:02:34,920 the first person to head 53 00:02:34,954 --> 00:02:37,422 to all five of the earth's oceans, 54 00:02:37,457 --> 00:02:39,358 find their deepest points, 55 00:02:39,392 --> 00:02:41,593 and explore their hidden secrets. 56 00:02:41,628 --> 00:02:44,897 So far, he has completed two of the five. 57 00:02:47,267 --> 00:02:49,234 Overcoming storms in the Atlantic 58 00:02:49,269 --> 00:02:51,270 to find new species... 59 00:02:51,304 --> 00:02:53,105 - At bottom. - Yeah! 60 00:02:53,139 --> 00:02:55,040 [Demetri] ...and braving freezing waters 61 00:02:55,074 --> 00:02:58,177 to triumph in the Southern Ocean. 62 00:02:58,211 --> 00:03:00,979 - [man] Great job. - [Patrick] All right, Victor! 63 00:03:03,449 --> 00:03:07,719 [Demetri] Their third deep dive is in the Indian Ocean. 64 00:03:07,754 --> 00:03:10,489 This is the youngest of the oceans. 65 00:03:10,523 --> 00:03:11,924 It's also the warmest, 66 00:03:13,526 --> 00:03:16,361 with an average surface temperature of 90 degrees 67 00:03:16,396 --> 00:03:17,663 Fahrenheit. 68 00:03:18,898 --> 00:03:20,766 Beneath the waves, the sea floor 69 00:03:20,800 --> 00:03:22,267 is one of the most geologically 70 00:03:22,302 --> 00:03:24,403 volatile areas in the world. 71 00:03:25,605 --> 00:03:27,973 A landscape of unpredictable faults, 72 00:03:28,007 --> 00:03:31,109 fractures and earthquakes 73 00:03:31,144 --> 00:03:33,879 that over the last few decades has generated 74 00:03:33,913 --> 00:03:36,715 five of history's deadliest tsunamis. 75 00:03:38,384 --> 00:03:40,118 [man] Get in! Get in! Get in! 76 00:03:41,654 --> 00:03:43,388 [Demetri] The ocean's deepest point 77 00:03:43,423 --> 00:03:44,556 lies at the epicenter 78 00:03:44,591 --> 00:03:46,225 of a tsunami trigger zone. 79 00:03:47,794 --> 00:03:49,428 The Java Trench. 80 00:03:51,097 --> 00:03:54,866 Where two giant plates in the earth's crust collide. 81 00:03:56,636 --> 00:03:58,604 A crucial part of Victor's mission 82 00:03:58,638 --> 00:04:01,206 will be to search for evidence on the sea floor 83 00:04:01,241 --> 00:04:04,042 of what is causing the tsunamis. 84 00:04:04,077 --> 00:04:06,645 [Victor] The more data we have from the deep oceans 85 00:04:06,679 --> 00:04:08,547 the better our models could be 86 00:04:08,581 --> 00:04:11,049 to predict these things. 87 00:04:11,084 --> 00:04:14,786 No-one, and I mean no-one has ever been 88 00:04:14,821 --> 00:04:15,988 near the bottom of this trench, 89 00:04:16,022 --> 00:04:17,456 or even explored it. 90 00:04:17,490 --> 00:04:19,691 We don't know what's down there. 91 00:04:23,029 --> 00:04:25,264 [Demetri] At over 23,000 feet deep, 92 00:04:25,298 --> 00:04:27,065 the pressure will be immense. 93 00:04:27,133 --> 00:04:30,202 Any ordinary sub would simply implode. 94 00:04:32,238 --> 00:04:36,341 So Victor has commissioned a pioneering new design. 95 00:04:36,376 --> 00:04:38,810 - Go ahead and jack it up. - [man] Roger. 96 00:04:38,845 --> 00:04:41,713 [Demetri] Its secret strength lies at its core. 97 00:04:43,149 --> 00:04:47,319 The cockpit is a ball of 3.5-inch thick titanium. 98 00:04:47,353 --> 00:04:49,388 If this wasn't a perfect sphere, 99 00:04:49,422 --> 00:04:52,658 it could crumple like a tin can. 100 00:04:52,692 --> 00:04:54,893 Inside, a rack of oxygen tanks 101 00:04:54,927 --> 00:04:58,597 provides up to 96 hours of emergency life support. 102 00:04:59,866 --> 00:05:01,066 [Victor] If someone needs to go down 103 00:05:01,100 --> 00:05:02,134 to the bottom of the ocean, 104 00:05:02,168 --> 00:05:03,635 there's submarine jet. 105 00:05:03,670 --> 00:05:05,504 It's now the deepest-diving submersible in the world. 106 00:05:05,538 --> 00:05:07,406 In fact, it's actually the deepest-diving 107 00:05:07,440 --> 00:05:09,808 vehicle, period. 108 00:05:09,842 --> 00:05:11,143 [Rob] You know, I think the submersible 109 00:05:11,177 --> 00:05:12,377 is the most significant 110 00:05:12,412 --> 00:05:14,579 vehicle since Apollo 11. 111 00:05:14,614 --> 00:05:16,448 This is a vehicle that will allow us 112 00:05:16,482 --> 00:05:18,884 to explore the last frontier on Earth. 113 00:05:18,918 --> 00:05:20,952 [Demetri] But if something serious goes wrong 114 00:05:20,987 --> 00:05:22,688 at full ocean depth, 115 00:05:22,722 --> 00:05:24,323 there's no hope of rescue. 116 00:05:24,357 --> 00:05:25,657 [Victor] It's the only thing in the world 117 00:05:25,692 --> 00:05:27,025 right now that can go 118 00:05:27,060 --> 00:05:30,295 below 7,000 meters. Not even a remotely-piloted vehicle 119 00:05:30,330 --> 00:05:31,363 can do that. 120 00:05:31,397 --> 00:05:33,131 We're getting the tow line off. 121 00:05:33,166 --> 00:05:35,701 [Demetri] And the sub is still very much a prototype. 122 00:05:35,735 --> 00:05:37,636 Let it go. 123 00:05:37,670 --> 00:05:39,604 [Demetri] In the first two ocean dives, 124 00:05:39,639 --> 00:05:43,108 the sub team faced a massive learning curve. 125 00:05:43,142 --> 00:05:44,242 [Patrick] Surface systems all up. 126 00:05:44,277 --> 00:05:45,944 We have leaking hatch. 127 00:05:45,978 --> 00:05:47,813 [Kelvin] There's a reason why nobody has done this before. 128 00:05:47,847 --> 00:05:48,847 It's not easy. 129 00:05:48,881 --> 00:05:51,316 It's going to an extreme environment. 130 00:05:51,351 --> 00:05:53,919 There's no rescue plan. This has to come back. 131 00:05:53,953 --> 00:05:55,120 It has to work. 132 00:05:55,154 --> 00:05:57,322 Up on the main, whoa, whoa, whoa, whoa! 133 00:05:57,357 --> 00:05:59,725 [bleep] 134 00:05:59,759 --> 00:06:01,693 It's sort of testing by breaking. 135 00:06:01,728 --> 00:06:02,761 Back on the tag line. 136 00:06:04,964 --> 00:06:07,032 [bleep] Why are we doing this? 137 00:06:07,066 --> 00:06:08,567 [Victor] And there's always a lot of heartache 138 00:06:08,634 --> 00:06:09,968 in that process, 139 00:06:10,002 --> 00:06:12,404 because for every two steps you take forward... 140 00:06:12,438 --> 00:06:13,805 [bleep] 141 00:06:13,840 --> 00:06:15,006 [Victor] ...you've got to come back 142 00:06:15,041 --> 00:06:16,274 and relearn one of them. 143 00:06:16,309 --> 00:06:18,777 [man] What am I supposed to do? 144 00:06:18,811 --> 00:06:21,380 [bleep] 145 00:06:21,414 --> 00:06:24,182 It can take up to 30 or even 40 dives 146 00:06:24,217 --> 00:06:25,584 with a brand-new submersible, 147 00:06:25,618 --> 00:06:28,487 especially one designed with these extreme features, 148 00:06:28,521 --> 00:06:31,423 to get it to where things are working well. 149 00:06:31,457 --> 00:06:32,491 [Patrick] Okay, you guys ready? 150 00:06:32,525 --> 00:06:34,025 Roger, go ahead. 151 00:06:34,060 --> 00:06:36,461 [Demetri] Even if the sub is fully operational, 152 00:06:36,496 --> 00:06:40,165 the team face a major hazard of the Indian Ocean. 153 00:06:43,269 --> 00:06:45,737 It's tropical cyclone season. 154 00:06:45,772 --> 00:06:47,672 [Rob] The sea temperature at the moment is about 155 00:06:47,707 --> 00:06:50,876 30, 31 degrees Celsius, which is extremely warm. 156 00:06:50,910 --> 00:06:53,678 And warm water is the fuel of cyclones. 157 00:06:56,382 --> 00:06:58,517 The pressure is on to complete the mission 158 00:06:58,551 --> 00:07:02,087 before a cyclone forces them to seek shelter. 159 00:07:03,790 --> 00:07:05,157 First, the team need to use 160 00:07:05,191 --> 00:07:07,492 their high-resolution sonar scanner 161 00:07:07,527 --> 00:07:10,562 to map the uncharted depths of the Java Trench 162 00:07:10,596 --> 00:07:12,464 and pinpoint the precise location 163 00:07:12,498 --> 00:07:13,532 of the deepest point 164 00:07:13,566 --> 00:07:15,100 of the Indian Ocean. 165 00:07:15,134 --> 00:07:17,903 [Victor] It's one of the most advanced sonars in the world. 166 00:07:17,937 --> 00:07:20,906 It's actually military grade. And it has the capability 167 00:07:20,940 --> 00:07:23,742 to acoustically survey the bottom of the ocean 168 00:07:23,776 --> 00:07:26,478 all the way to full ocean depth and map it. 169 00:07:26,512 --> 00:07:28,814 [Demetri] The early scans are already revealing 170 00:07:28,848 --> 00:07:31,383 crucial new evidence to help a key mission 171 00:07:31,417 --> 00:07:33,852 of this expedition. 172 00:07:33,886 --> 00:07:36,087 The search for the causes of the deadly 173 00:07:36,122 --> 00:07:38,490 Indian Ocean tsunamis. 174 00:07:40,092 --> 00:07:42,661 [man] In that northern wall, we've found at least 14 175 00:07:42,695 --> 00:07:43,962 slope failures. 176 00:07:43,996 --> 00:07:46,631 Some of those are four or five kilometers wide, 177 00:07:46,666 --> 00:07:49,868 where big chunks essentially come loose during earthquakes 178 00:07:49,902 --> 00:07:51,169 and slump to the sea floor. 179 00:07:51,204 --> 00:07:54,372 And they can be responsible for tsunamis. 180 00:07:54,407 --> 00:07:56,475 [Demetri] Monster landslides like these 181 00:07:56,509 --> 00:07:59,711 displace vast amounts of water that on the surface 182 00:07:59,745 --> 00:08:03,014 turn into devastating tsunamis. 183 00:08:03,049 --> 00:08:04,649 The scans have also revealed 184 00:08:04,684 --> 00:08:07,185 a near-vertical cliff that may be the site 185 00:08:07,220 --> 00:08:10,522 of the next catastrophic collapse. 186 00:08:10,556 --> 00:08:11,756 What we need to do 187 00:08:11,791 --> 00:08:14,059 is actually go down and get some eyes on that 188 00:08:14,093 --> 00:08:16,661 and try and find out whether these areas 189 00:08:16,696 --> 00:08:20,332 are about to fall, or if we've got areas 190 00:08:20,366 --> 00:08:22,901 that fell a long time ago and the whole area 191 00:08:22,935 --> 00:08:24,503 is actually quite stable. 192 00:08:24,537 --> 00:08:26,671 [Demetri] The team decide to add to their mission 193 00:08:26,706 --> 00:08:29,608 a research dive down to this cliff. 194 00:08:29,642 --> 00:08:31,276 [Patrick] The sonar has identified 195 00:08:31,310 --> 00:08:32,844 a key geological feature 196 00:08:32,879 --> 00:08:35,847 which otherwise would not have been found. 197 00:08:35,882 --> 00:08:37,883 And you have the tool to go and dive on it. 198 00:08:37,917 --> 00:08:40,585 - So this is great. - This is what we're here for, 199 00:08:40,620 --> 00:08:42,554 to find things like this. 200 00:08:42,588 --> 00:08:44,756 [Demetri] It's a one-off opportunity to explore 201 00:08:44,790 --> 00:08:46,825 the dark secrets of the Indian Ocean. 202 00:08:46,859 --> 00:08:49,694 But it will be the first time the sub has had to navigate 203 00:08:49,729 --> 00:08:53,665 so close to a potentially hazardous rock face. 204 00:08:53,733 --> 00:08:55,433 [Victor] It's kinda hard to get a sense 205 00:08:55,468 --> 00:08:56,968 of angle when you're down there 206 00:08:57,003 --> 00:09:00,405 because your field of view is only about 10 or 15 meters. 207 00:09:00,439 --> 00:09:02,774 [Demetri] Victor decides to put at the sub's helm 208 00:09:02,808 --> 00:09:05,410 the most experienced sub pilot on board 209 00:09:05,444 --> 00:09:07,345 and the builder of the sub itself, 210 00:09:07,380 --> 00:09:08,680 Patrick Lahey. 211 00:09:08,714 --> 00:09:09,981 [Victor] You'll go down, and you'll try 212 00:09:10,016 --> 00:09:11,816 and find the wall first. 213 00:09:11,851 --> 00:09:13,785 We should have a plan and stick to that plan. 214 00:09:13,819 --> 00:09:16,688 The priority is get a lovely video of that slope. 215 00:09:16,722 --> 00:09:18,623 [Demetri] Chief scientist Alan Jamieson 216 00:09:18,658 --> 00:09:21,560 will join Patrick to guide the search. 217 00:09:23,896 --> 00:09:26,798 [Kelvin] All right, see you, guys. 218 00:09:26,832 --> 00:09:28,366 Hatch secured. 219 00:09:29,635 --> 00:09:32,304 Okay, LF, swimmer's clear, you're clear to dive. 220 00:09:32,338 --> 00:09:34,739 Roger that. I got a green board. 221 00:09:41,013 --> 00:09:42,714 [Alan] We're away. 222 00:09:47,153 --> 00:09:49,621 [Demetri] Two and half hours after leaving the surface, 223 00:09:49,655 --> 00:09:52,290 and over 22,000 feet down, 224 00:09:52,325 --> 00:09:55,160 finally their target comes into view. 225 00:09:56,162 --> 00:09:58,930 Whoa. There's the wall. 226 00:09:58,965 --> 00:10:00,665 [Alan] We've got some rocks. 227 00:10:00,733 --> 00:10:02,467 A lot of boulders. 228 00:10:02,501 --> 00:10:04,769 We're gonna take it easy here now. 229 00:10:06,539 --> 00:10:10,875 [Demetri] The cliff towers over 600 feet above them. 230 00:10:10,910 --> 00:10:13,812 Patrick will need to be extremely careful. 231 00:10:13,846 --> 00:10:18,494 A sudden rockfall could put the sub in serious danger. 232 00:10:18,518 --> 00:10:19,751 And down here, 233 00:10:19,785 --> 00:10:22,020 there's no other submersible in the world 234 00:10:22,054 --> 00:10:24,189 that can come to the rescue. 235 00:10:25,524 --> 00:10:27,759 Wow, it's steep. I have to give it 236 00:10:27,793 --> 00:10:30,028 a little vertical up there, buddy. 237 00:10:32,465 --> 00:10:34,633 Oh, there's a... Excuse me, look at that. 238 00:10:34,667 --> 00:10:36,735 Big boulders to my right there. 239 00:10:36,769 --> 00:10:40,171 [Alan] Whoa, whoa, whoa, whoa, we need to back off. 240 00:10:40,206 --> 00:10:42,140 This is a massive overhang. 241 00:10:43,709 --> 00:10:46,478 Back off. Watch yourself, watch yourself. 242 00:10:46,512 --> 00:10:48,546 Pull up, pull up, pull up! [bleep] 243 00:10:57,723 --> 00:11:00,025 [Demetri] Scientist Alan and sub builder Patrick 244 00:11:00,059 --> 00:11:02,827 are diving into an active geological faultline 245 00:11:02,862 --> 00:11:05,130 where no-one has been before. 246 00:11:05,164 --> 00:11:06,464 [Alan] Watch yourself. Watch yourself. 247 00:11:06,499 --> 00:11:08,600 [Patrick] I'm backing away, man. 248 00:11:13,239 --> 00:11:15,306 [Demetri] They are seizing a unique opportunity 249 00:11:15,341 --> 00:11:16,875 to investigate the origins 250 00:11:16,909 --> 00:11:19,144 of deadly Indian Ocean tsunamis 251 00:11:19,178 --> 00:11:22,113 triggered by massive underwater landslides. 252 00:11:23,482 --> 00:11:26,518 Could this precarious wall be the next disaster 253 00:11:26,552 --> 00:11:28,687 waiting to happen? 254 00:11:28,721 --> 00:11:30,021 Those are big chunks of... 255 00:11:30,056 --> 00:11:31,790 looks like volcanic rock, right? 256 00:11:31,824 --> 00:11:32,957 Yeah. 257 00:11:34,293 --> 00:11:35,460 [Heather] We see these black rocks, 258 00:11:35,494 --> 00:11:36,628 and these are rocks 259 00:11:36,662 --> 00:11:38,797 that were once molten, and they've cooled down 260 00:11:38,831 --> 00:11:41,066 and they're black because 261 00:11:41,100 --> 00:11:42,567 they've cooled down really quickly 262 00:11:42,601 --> 00:11:45,403 so they've been erupted onto the sea floor. 263 00:11:45,438 --> 00:11:47,238 [Patrick] Just creep up the wall here. 264 00:11:47,273 --> 00:11:48,807 It's gonna bring us in closer. 265 00:11:50,042 --> 00:11:52,610 Look how precarious this rock is. 266 00:11:52,645 --> 00:11:54,757 This is a great big tower, this. 267 00:11:54,781 --> 00:11:56,181 [Alan] You can see from that, 268 00:11:56,215 --> 00:11:58,650 it's not gonna take much of a rumble for that to collapse. 269 00:11:58,684 --> 00:12:00,418 [Demetri] A landslide here 270 00:12:00,453 --> 00:12:03,421 and the sub could be buried under a cascade of rocks 271 00:12:03,456 --> 00:12:04,923 and sediment. 272 00:12:04,957 --> 00:12:05,890 - [thud] - [Patrick] Whoa. 273 00:12:05,925 --> 00:12:07,525 What the hell was that? 274 00:12:11,330 --> 00:12:15,400 [man] LF, could you send me a status update? 275 00:12:15,434 --> 00:12:18,403 [static] 276 00:12:22,441 --> 00:12:25,810 [man] LF, could you repeat your last? 277 00:12:32,151 --> 00:12:33,651 I'm backing off. 278 00:12:40,693 --> 00:12:42,861 Whoa. 279 00:12:42,895 --> 00:12:45,396 Wow! Look at the colors of the rocks. 280 00:12:45,431 --> 00:12:47,132 [Alan] Stunning. 281 00:12:47,166 --> 00:12:49,300 [Heather] Something that I wasn't expecting 282 00:12:49,335 --> 00:12:52,237 are these multi-colored areas 283 00:12:52,271 --> 00:12:55,106 of what look to be bacterial mats. 284 00:12:55,141 --> 00:12:56,975 Bright whites, oranges. 285 00:12:57,009 --> 00:12:58,543 There's even some blues in there. 286 00:12:58,577 --> 00:13:02,313 Really spectacular colors. These are bacteria 287 00:13:02,348 --> 00:13:06,718 living off the fluid that is coming out of the sea floor. 288 00:13:06,752 --> 00:13:09,354 [Demetri] It is an extraordinary form of life, 289 00:13:09,388 --> 00:13:11,656 feeding on the seabed itself. 290 00:13:11,690 --> 00:13:14,125 And it's the first time anyone has seen it 291 00:13:14,160 --> 00:13:17,262 at such enormous depths in the Indian Ocean. 292 00:13:17,296 --> 00:13:20,098 Yeah, certainly flat now. 293 00:13:20,132 --> 00:13:22,200 [Demetri] The mission has given the expedition 294 00:13:22,234 --> 00:13:23,968 a remarkable insight into 295 00:13:24,003 --> 00:13:26,471 one of the most volatile geological hotspots 296 00:13:26,505 --> 00:13:28,206 in the world. 297 00:13:29,742 --> 00:13:31,442 [Heather] Actually getting eyes on the seabed 298 00:13:31,477 --> 00:13:34,746 and looking at some of these mass movements 299 00:13:34,780 --> 00:13:37,482 and the block failures, we can start to 300 00:13:37,516 --> 00:13:40,084 piece together with a bit more certainty 301 00:13:40,119 --> 00:13:42,253 the different processes going on 302 00:13:42,288 --> 00:13:43,822 in the Java Trench. 303 00:13:43,856 --> 00:13:47,425 Some of these are related to potential tsunamis 304 00:13:47,459 --> 00:13:50,028 in the future or indeed in the past. 305 00:13:50,062 --> 00:13:52,664 We've done our job, right? We found the wall. 306 00:13:52,698 --> 00:13:55,066 [Patrick] Surface, LF. Present depth, 307 00:13:55,100 --> 00:13:57,402 at the top of the wall. 308 00:13:57,436 --> 00:14:00,505 [cheering] 309 00:14:00,539 --> 00:14:02,340 Whoo! Excellent. 310 00:14:02,374 --> 00:14:04,909 I'm so happy for them. 311 00:14:04,944 --> 00:14:08,213 [Hob] Surface, LF. Requesting permission 312 00:14:08,247 --> 00:14:11,783 - to leave bottom. - Roger that. 313 00:14:11,817 --> 00:14:14,786 Releasing surfacing weight now. Here we go. 314 00:14:21,927 --> 00:14:23,461 [Demetri] Despite a few scratches 315 00:14:23,495 --> 00:14:25,263 to the sub's outer housing, 316 00:14:25,297 --> 00:14:27,899 the dive has been a huge success. 317 00:14:29,401 --> 00:14:31,970 - [man] Coming down. - [man] Coming down. Okay. 318 00:14:32,004 --> 00:14:33,538 [Demetri] But as well as studying 319 00:14:33,572 --> 00:14:35,073 the geology of the trench, 320 00:14:35,107 --> 00:14:38,576 Chief Scientist Alan Jamieson is also eager to explore, 321 00:14:38,610 --> 00:14:41,913 for the very first time, what lifeforms have adapted 322 00:14:41,947 --> 00:14:44,115 to live in its crushing depths. 323 00:14:44,149 --> 00:14:45,550 [Alan] The Indian Ocean's kind of renowned 324 00:14:45,584 --> 00:14:48,152 for having never been properly 325 00:14:48,187 --> 00:14:50,922 studied, and that's the same for the shallow water, 326 00:14:50,956 --> 00:14:53,358 never mind the very, very deep water. 327 00:14:55,728 --> 00:14:58,863 [Demetri] A set of underwater probes known as landers 328 00:14:58,898 --> 00:15:00,465 packed with technology 329 00:15:00,499 --> 00:15:04,535 will use baited cameras to film life on the seabed. 330 00:15:06,705 --> 00:15:08,806 The target is in an area near the bottom 331 00:15:08,841 --> 00:15:10,842 of the Java Trench. 332 00:15:10,876 --> 00:15:12,477 But first, the probes must 333 00:15:12,511 --> 00:15:14,078 pass through ever deeper layers 334 00:15:14,113 --> 00:15:17,015 of the Indian Ocean, where remarkable creatures 335 00:15:17,049 --> 00:15:19,284 find their home. 336 00:15:20,953 --> 00:15:23,187 From the Sunlight Zone, where sunfish 337 00:15:23,222 --> 00:15:26,791 the size of pick-up trucks bask on the surface... 338 00:15:29,762 --> 00:15:32,664 ...and dugong, distant relations of the elephant, 339 00:15:32,698 --> 00:15:34,599 graze on seagrass... 340 00:15:37,703 --> 00:15:39,270 ...to the Twilight Zone, 341 00:15:39,305 --> 00:15:41,673 where monster six-gill sharks, 342 00:15:41,707 --> 00:15:44,175 unchanged from the time of the dinosaurs, 343 00:15:44,209 --> 00:15:48,079 lurk during the day, surfacing to hunt by night. 344 00:15:50,249 --> 00:15:51,783 And where leatherback turtles, 345 00:15:51,817 --> 00:15:53,384 the deepest-diving reptiles 346 00:15:53,419 --> 00:15:54,419 on the planet, 347 00:15:54,453 --> 00:15:57,622 come hunting for jellyfish. 348 00:15:57,656 --> 00:16:00,258 Their flexible shells and collapsible lungs 349 00:16:00,292 --> 00:16:02,493 make them perfectly adapted to survive 350 00:16:02,528 --> 00:16:05,263 the crushing pressures. 351 00:16:05,297 --> 00:16:06,531 Deeper still, 352 00:16:06,565 --> 00:16:08,933 into the Midnight Zone, 353 00:16:08,968 --> 00:16:12,136 where vampire squid use their cape-like folds 354 00:16:12,171 --> 00:16:14,472 lined with tiny spines 355 00:16:14,506 --> 00:16:16,407 to protect themselves against attack 356 00:16:16,442 --> 00:16:18,876 by deep-diving predatory fish. 357 00:16:21,113 --> 00:16:23,114 And slender snipe eels 358 00:16:23,148 --> 00:16:26,284 use microscopic hooked teeth on their beak-like jaws 359 00:16:26,318 --> 00:16:30,154 to snare shrimp. 360 00:16:30,189 --> 00:16:32,090 Finally, the scientific probes 361 00:16:32,124 --> 00:16:35,326 reach the very deepest zone of the Indian Ocean, 362 00:16:35,361 --> 00:16:36,828 the Hadal Zone. 363 00:16:41,800 --> 00:16:45,103 Now their cameras are the very first in history 364 00:16:45,137 --> 00:16:48,206 to film in this inhospitable landscape. 365 00:16:48,240 --> 00:16:49,974 And they capture rare footage 366 00:16:50,009 --> 00:16:52,343 of an elusive deep-ocean hunter. 367 00:16:59,385 --> 00:17:01,019 [Alan] Nobody really knows anything about them. 368 00:17:01,053 --> 00:17:02,653 Their common name is assfish. 369 00:17:02,688 --> 00:17:05,556 - Not a great name. - Not a great name. 370 00:17:05,591 --> 00:17:08,026 If you look, it's got this double nostril here. 371 00:17:08,060 --> 00:17:09,260 It's got massive nostrils. 372 00:17:09,294 --> 00:17:10,395 It doesn't care about the bait. 373 00:17:10,429 --> 00:17:12,163 All it knows is, where it can smell bait 374 00:17:12,197 --> 00:17:13,798 there's going to be an accumulation of amphipods, 375 00:17:13,832 --> 00:17:17,668 so it turns up and just picks them off. 376 00:17:17,703 --> 00:17:19,470 [Demetri] Once a crowd of the shrimp-like 377 00:17:19,505 --> 00:17:22,607 scavengers arrive, it's dinnertime. 378 00:17:30,549 --> 00:17:32,417 Then, from one of the darkest, 379 00:17:32,451 --> 00:17:34,585 most remote parts of the planet, 380 00:17:34,620 --> 00:17:36,654 comes the rarest of creatures. 381 00:17:36,688 --> 00:17:38,823 A Dumbo octopus. 382 00:17:38,857 --> 00:17:41,259 Remarkably, it's the deepest octopus 383 00:17:41,293 --> 00:17:44,362 ever filmed by almost 6,000 feet. 384 00:17:45,531 --> 00:17:47,231 Its tentacles are joined together 385 00:17:47,266 --> 00:17:51,235 by a web of skin to form an umbrella-like body. 386 00:17:51,270 --> 00:17:53,104 And the huge, ear-like fins 387 00:17:53,138 --> 00:17:54,772 that give the Dumbo its name 388 00:17:54,807 --> 00:17:58,976 help to make it an extremely agile swimmer. 389 00:17:59,011 --> 00:18:02,380 It's waiting for the bait to lure its favorite meal. 390 00:18:03,582 --> 00:18:05,917 An unsuspecting deep-sea crustacean 391 00:18:05,951 --> 00:18:09,087 is moving across the seabed. 392 00:18:09,121 --> 00:18:10,788 In such a pitch-black home, 393 00:18:10,823 --> 00:18:13,491 the Dumbo's eyes are virtually sightless. 394 00:18:13,525 --> 00:18:16,194 Instead, it uses sensors in its tentacles 395 00:18:16,228 --> 00:18:17,762 to pinpoint its prey. 396 00:18:23,569 --> 00:18:24,936 [Alan] Quite often, octopus do 397 00:18:24,970 --> 00:18:26,104 they will sit on top of a crustacean 398 00:18:26,138 --> 00:18:27,371 and then they'll bore a hole through it 399 00:18:27,406 --> 00:18:29,173 at the back of its shell 400 00:18:29,208 --> 00:18:30,641 and then will inject it with saliva. 401 00:18:30,676 --> 00:18:32,743 And it dissolves the shrimp, for example, 402 00:18:32,778 --> 00:18:34,312 from the inside and then sucks it out. 403 00:18:34,346 --> 00:18:36,414 - That's disgusting. - Right. 404 00:18:36,448 --> 00:18:38,249 [Demetri] The probes have brought back 405 00:18:38,283 --> 00:18:41,486 remarkable images from the deep. 406 00:18:41,520 --> 00:18:44,222 And now the scanning team have dramatic news 407 00:18:44,256 --> 00:18:47,558 for the expedition of Victor's ultimate target. 408 00:18:47,593 --> 00:18:50,161 This tiny sinkhole is the deepest point 409 00:18:50,195 --> 00:18:51,662 in the Indian Ocean. 410 00:18:51,697 --> 00:18:53,331 [Demetri] It will be the most challenging 411 00:18:53,365 --> 00:18:55,199 of the deeps yet attempted. 412 00:18:55,234 --> 00:18:56,767 [Victor] We are going to drop right into it 413 00:18:56,802 --> 00:18:58,603 almost like trying to drop a marble 414 00:18:58,637 --> 00:19:01,205 into a bucket 50 meters down. 415 00:19:01,240 --> 00:19:02,807 My highest priority 416 00:19:02,841 --> 00:19:04,976 is getting you safely back on board. 417 00:19:14,720 --> 00:19:16,854 [Demetri] The scanning team have finished mapping 418 00:19:16,889 --> 00:19:20,224 the previously uncharted reaches of the Java Trench. 419 00:19:20,259 --> 00:19:21,993 It is a critical moment in the mission 420 00:19:22,027 --> 00:19:23,794 because the trench might not hold 421 00:19:23,829 --> 00:19:26,831 the deepest point in the Indian ocean after all. 422 00:19:26,865 --> 00:19:28,833 The team now need to compare the data 423 00:19:28,867 --> 00:19:31,536 with a rival candidate scanned on their way. 424 00:19:31,570 --> 00:19:34,138 A fracture zone off the coast of Australia 425 00:19:34,173 --> 00:19:36,274 called Diamantina. 426 00:19:36,308 --> 00:19:38,342 [Cassie] This yellow dot right here 427 00:19:38,377 --> 00:19:39,644 is the deepest point 428 00:19:39,678 --> 00:19:44,282 within this big basin of Diamantina Fracture Zone. 429 00:19:44,316 --> 00:19:48,052 At 7,019 meters. 430 00:19:48,086 --> 00:19:50,922 [Demetri] If the Java Trench turns out to be shallower, 431 00:19:50,956 --> 00:19:54,258 then the expedition is 1,000 miles off course. 432 00:19:55,961 --> 00:19:58,362 [Victor] We continue to learn new things. 433 00:19:58,397 --> 00:20:00,431 I think Cassie and her team understated what they've done, 434 00:20:00,465 --> 00:20:03,467 but we have solved the mystery that has always been around, 435 00:20:03,502 --> 00:20:04,969 which is what is the deepest point 436 00:20:05,003 --> 00:20:06,470 in the Indian Ocean. 437 00:20:06,505 --> 00:20:07,738 Until this week, 438 00:20:07,773 --> 00:20:09,707 no-one could definitively answer that question. 439 00:20:09,741 --> 00:20:11,008 In fact, there was a big debate 440 00:20:11,043 --> 00:20:13,244 whether it was the Diamantina or the Java Trench. 441 00:20:16,682 --> 00:20:17,982 Well, it is the Java Trench. 442 00:20:18,016 --> 00:20:19,016 It's not just the Java Trench, 443 00:20:19,051 --> 00:20:20,785 it's in a place no-one thought it was. 444 00:20:20,819 --> 00:20:24,088 It's in the center of it, not the east or the west. 445 00:20:24,122 --> 00:20:25,923 [Demetri] But to reach this deepest point 446 00:20:25,958 --> 00:20:28,559 will be a massive navigational challenge. 447 00:20:30,329 --> 00:20:32,463 In the middle of the Java Trench 448 00:20:32,497 --> 00:20:35,600 is this tiny sinkhole that we determined 449 00:20:35,634 --> 00:20:38,936 to be the deepest point in the Indian Ocean. 450 00:20:38,971 --> 00:20:40,838 And Victor is finding that. 451 00:20:43,141 --> 00:20:46,143 [dramatic music playing] 452 00:20:49,081 --> 00:20:50,748 [Victor] We're gonna drop right into it. 453 00:20:50,782 --> 00:20:51,849 Almost like trying to drop 454 00:20:51,883 --> 00:20:54,986 a marble into a bucket 50 meters down. 455 00:20:56,355 --> 00:20:58,089 This one you could actually miss. 456 00:21:00,425 --> 00:21:03,160 [Demetri] If the team get their calculations wrong, 457 00:21:03,195 --> 00:21:06,631 Victor will be navigating a dangerously rocky landscape 458 00:21:06,665 --> 00:21:08,966 with the risk of a damaging collision. 459 00:21:12,371 --> 00:21:13,537 [man] Coming up easy. 460 00:21:13,572 --> 00:21:15,373 [Demetri] To help Victor find his way, 461 00:21:15,407 --> 00:21:17,708 the team drop one of their robotic probes 462 00:21:17,743 --> 00:21:19,910 directly above the deepest point. 463 00:21:22,881 --> 00:21:25,082 It has an on board modem to communicate 464 00:21:25,117 --> 00:21:28,753 with the ship and the sub. 465 00:21:28,787 --> 00:21:30,921 Victor will then have to find the probe 466 00:21:30,956 --> 00:21:33,424 to reach the deepest point. 467 00:21:33,458 --> 00:21:35,493 Normally, two other probes are also launched 468 00:21:35,527 --> 00:21:36,927 to other sites on the seabed 469 00:21:36,962 --> 00:21:40,464 to help calculate Victor's exact position. 470 00:21:40,499 --> 00:21:41,799 On this dive, 471 00:21:41,833 --> 00:21:43,467 the team are gambling that Victor 472 00:21:43,502 --> 00:21:46,370 can navigate alone. 473 00:21:46,405 --> 00:21:49,473 We don't have a vast, open plane down there. 474 00:21:49,508 --> 00:21:50,841 We thought we'd put the lander 475 00:21:50,876 --> 00:21:52,476 directly over on top of the target, 476 00:21:52,511 --> 00:21:53,844 and you directly on the target. 477 00:21:53,879 --> 00:21:55,746 Without the landers to triangulate 478 00:21:55,781 --> 00:21:58,482 we won't be able to guide him to the actual position. 479 00:21:58,517 --> 00:22:00,618 So it is a little bit riskier. 480 00:22:00,652 --> 00:22:03,988 If he sees the lander, then he's at the deepest point. 481 00:22:04,022 --> 00:22:06,390 [Demetri] With the probe now signaling from the seabed, 482 00:22:06,425 --> 00:22:08,159 the team need to launch Victor 483 00:22:08,193 --> 00:22:10,795 as quickly as they can. 484 00:22:10,829 --> 00:22:13,397 The tropical cyclone seen brewing on the horizon 485 00:22:13,432 --> 00:22:16,267 is now gathering strength and threatening to end 486 00:22:16,301 --> 00:22:18,202 the multi-million-dollar expedition 487 00:22:18,236 --> 00:22:19,837 before Victor has had a chance 488 00:22:19,871 --> 00:22:21,339 to complete his dive. 489 00:22:24,343 --> 00:22:26,143 [Rob] So it's a large storm system, 490 00:22:26,178 --> 00:22:28,446 it's about 300 miles across. 491 00:22:30,315 --> 00:22:33,451 It's generating this huge vortex, the cyclone. 492 00:22:33,485 --> 00:22:37,088 Running at about 65 knots, maybe 75 knots. 493 00:22:37,122 --> 00:22:39,590 And waves of six to eight meters. 494 00:22:39,624 --> 00:22:42,193 And we are just up in this area. 495 00:22:42,227 --> 00:22:44,428 There's an element of chance in all of this, 496 00:22:44,463 --> 00:22:46,931 because it depends on where the cyclone 497 00:22:46,965 --> 00:22:50,034 is drawing its fuel from as to where it'll hit. 498 00:22:50,068 --> 00:22:52,169 We can't dally too long here. 499 00:22:52,204 --> 00:22:54,238 It could make life a little bit difficult for us. 500 00:22:54,272 --> 00:22:55,639 [Rob] Here in the tropics, 501 00:22:55,674 --> 00:22:57,675 we can usually find somewhere to hide. 502 00:22:57,709 --> 00:23:00,611 But of course that will rob us of any chance to do a dive. 503 00:23:00,645 --> 00:23:02,546 The nightmare scenario for me is the weather 504 00:23:02,581 --> 00:23:04,615 picks up very quickly, very late, 505 00:23:04,649 --> 00:23:07,585 and then we have trouble recovering it. 506 00:23:07,619 --> 00:23:10,287 [Demetri] If Victor is going to become the first person 507 00:23:10,322 --> 00:23:12,022 to touch down at the deepest point 508 00:23:12,057 --> 00:23:13,457 in the Indian Ocean, 509 00:23:13,492 --> 00:23:15,059 the team need to get him launched 510 00:23:15,093 --> 00:23:18,963 as quickly as possible. 511 00:23:18,997 --> 00:23:20,331 [Kelvin] Roger that. 512 00:23:24,202 --> 00:23:27,004 [Patrick] Okay, Victor, ready for you. 513 00:23:27,038 --> 00:23:28,906 [Kelvin] Okay, grab that, grab that. 514 00:23:37,048 --> 00:23:39,950 [Victor] This is the LF, life support is on and good. 515 00:23:39,985 --> 00:23:42,286 I have a green board. I am good to launch. 516 00:23:42,320 --> 00:23:43,554 [Patrick] Roger that. 517 00:23:49,327 --> 00:23:52,563 Swimmer is clear. You are clear to dive. 518 00:23:52,597 --> 00:23:54,632 [Victor] Swimmer is clear. Enabling thrusters. 519 00:24:00,472 --> 00:24:03,374 - [Tim] And he's gone. - [man] Whoo! Nice. 520 00:24:07,879 --> 00:24:11,682 [Victor] All right, we are descending. 521 00:24:11,716 --> 00:24:13,184 This seems a little slower than it did 522 00:24:13,218 --> 00:24:13,918 in the Southern Ocean. 523 00:24:13,952 --> 00:24:16,821 16 meters per minute. 524 00:24:16,855 --> 00:24:18,189 That's pretty slow. 525 00:24:18,223 --> 00:24:19,890 This could take a while to get down. 526 00:24:23,862 --> 00:24:27,865 [Victor] Present depth, eight-four-niner meters. 527 00:24:29,868 --> 00:24:31,735 [Patrick] That's awfully slow, isn't it? 528 00:24:33,972 --> 00:24:35,873 [Tim] It's 0.7, so 0.7 meters a second 529 00:24:35,907 --> 00:24:38,809 is 42 meters a minute. 530 00:24:43,715 --> 00:24:47,251 He went 400 meters in... 531 00:24:47,285 --> 00:24:51,121 15 minutes. That does seem slow. 532 00:24:51,156 --> 00:24:53,324 [Victor] Seven-seven. 533 00:24:53,358 --> 00:24:55,326 [Patrick] [bleep] Wow. 534 00:24:55,360 --> 00:24:57,628 Roger. One-zero-seven-seven. 535 00:24:59,464 --> 00:25:01,732 - [bleep] - [Victor] Roger. 536 00:25:01,766 --> 00:25:03,467 He's going real [bleep] slow. 537 00:25:03,502 --> 00:25:05,836 Something's not right. [bleep] 538 00:25:16,414 --> 00:25:18,249 [Demetri] With a mission-critical cyclone 539 00:25:18,283 --> 00:25:20,751 building over the horizon, 540 00:25:20,785 --> 00:25:23,387 Victor's attempt to be the first person in history 541 00:25:23,421 --> 00:25:26,056 to visit the deepest point of the Indian Ocean 542 00:25:26,091 --> 00:25:29,159 is in serious danger of unraveling. 543 00:25:29,194 --> 00:25:31,862 He's going real [bleep] slow. 544 00:25:31,897 --> 00:25:33,130 Something's wrong. 545 00:25:35,967 --> 00:25:37,434 [Demetri] The sub is dragged down 546 00:25:37,469 --> 00:25:39,904 through the water by a set of steel weights 547 00:25:39,938 --> 00:25:42,506 held in place by two electromagnets. 548 00:25:44,976 --> 00:25:46,577 The weights need to be heavy enough 549 00:25:46,611 --> 00:25:49,446 to override the specialist buoyant foam blocks 550 00:25:49,481 --> 00:25:52,449 that will ultimately pull the sub back to the surface. 551 00:25:55,353 --> 00:25:58,889 [Patrick] I can only assume that something's dropped off. 552 00:26:00,625 --> 00:26:01,859 That's the only thing it can be. 553 00:26:01,893 --> 00:26:04,128 I suspect that one of the magnets has failed. 554 00:26:04,162 --> 00:26:05,162 Which was the one that had 555 00:26:05,196 --> 00:26:06,297 the little bit of corrosion on it? 556 00:26:06,331 --> 00:26:08,532 It was the aft one. 557 00:26:08,567 --> 00:26:10,100 I cleaned that all up this morning. 558 00:26:10,135 --> 00:26:12,903 [Patrick] So, you know, we are just burning daylight. 559 00:26:16,074 --> 00:26:17,274 We are half-way there in two hours. 560 00:26:17,342 --> 00:26:19,143 [bleep] this is going to take four hours. 561 00:26:22,581 --> 00:26:24,782 [Demetri] Patrick, as mission control chief, 562 00:26:24,816 --> 00:26:28,752 now has a difficult call to make. 563 00:26:28,787 --> 00:26:32,456 To risk a lengthy dive, or pull the plug, 564 00:26:32,490 --> 00:26:34,158 get the sub back on the surface, 565 00:26:34,192 --> 00:26:36,126 and hope there's time for a second attempt 566 00:26:36,161 --> 00:26:37,995 before the cyclone hits. 567 00:26:38,029 --> 00:26:41,432 [Victor] I am still in descent, 568 00:26:41,466 --> 00:26:45,135 could make bottom, could make bottom. 569 00:26:48,673 --> 00:26:49,807 Roger that. 570 00:26:49,841 --> 00:26:52,743 Uh, Victor, I'm recommending an abort. 571 00:26:55,180 --> 00:26:58,115 I do not believe you can reach the bottom. 572 00:27:01,519 --> 00:27:04,355 Understand, you suggest abort. 573 00:27:05,991 --> 00:27:08,659 Pretty disappointed. 574 00:27:08,693 --> 00:27:10,227 [Stuart] Control bridge. 575 00:27:10,261 --> 00:27:13,130 [Patrick] Okay Stu be advised he has been given clearance 576 00:27:13,164 --> 00:27:15,466 to surface, ETA is just a couple of minutes. 577 00:27:15,500 --> 00:27:17,835 Yeah bridge copy. 578 00:27:17,869 --> 00:27:20,004 [Rob] Roger that. Let's roll. 579 00:27:26,077 --> 00:27:27,511 - [Victor] Hey. - [Tim] Hello. 580 00:27:27,545 --> 00:27:28,779 [Victor] Hey how you doing? 581 00:27:28,813 --> 00:27:30,047 [Tim] Good to see you back in one piece. 582 00:27:30,081 --> 00:27:32,383 [Victor] Good to be back. 583 00:27:32,417 --> 00:27:35,285 [Demetri] The pressure is on to get the sub fixed quick, 584 00:27:35,320 --> 00:27:37,221 and make a second dive. 585 00:27:40,692 --> 00:27:42,292 [Tim] Pissing out oil from that clamp, 586 00:27:42,327 --> 00:27:43,427 it's all twisted. 587 00:27:43,461 --> 00:27:46,530 Can I get some little cutters? Dites. 588 00:27:46,564 --> 00:27:47,798 [Victor] It's a complex system. 589 00:27:47,832 --> 00:27:48,932 There are many, many elements, 590 00:27:48,967 --> 00:27:50,067 whether it's the ballast system. 591 00:27:50,101 --> 00:27:51,435 One, two, three. 592 00:27:51,469 --> 00:27:53,837 [Victor] Or whether it's the communication system. 593 00:27:53,872 --> 00:27:55,039 [Patrick] Okay, are you guys ready? 594 00:27:55,073 --> 00:27:56,273 [Frank] I don't know what the [bleep] 595 00:27:56,307 --> 00:27:57,574 Is going on here. 596 00:27:57,609 --> 00:27:59,643 There are so many things that have to work just right 597 00:27:59,711 --> 00:28:03,047 for this ballet to come off without a hitch. 598 00:28:03,081 --> 00:28:04,581 [Demetri] But in boiling temperatures 599 00:28:04,616 --> 00:28:06,984 pushing 84 degrees Fahrenheit, 600 00:28:07,018 --> 00:28:09,853 the sub engineering team are nearing breaking point. 601 00:28:09,888 --> 00:28:12,690 [Frank] Okay. I'm going as fast as I [bleep] can. 602 00:28:12,724 --> 00:28:14,058 [Victor] There is a lot of stress on people 603 00:28:14,092 --> 00:28:15,592 to get everything right. 604 00:28:15,627 --> 00:28:19,396 [Tim] Frank, turn it off. 605 00:28:19,431 --> 00:28:20,698 Had enough, man. 606 00:28:20,732 --> 00:28:22,099 Ready to go home. 607 00:28:22,133 --> 00:28:23,233 [Patrick] Hang on just a second. 608 00:28:23,268 --> 00:28:25,069 We've got a hose trapped in there. 609 00:28:25,103 --> 00:28:26,637 [Victor] I think people are learning, you know, 610 00:28:26,671 --> 00:28:27,871 kind of what they have to do 611 00:28:27,906 --> 00:28:29,239 and how much attention to detail they have 612 00:28:29,274 --> 00:28:31,208 to have to make it all work right. 613 00:28:31,242 --> 00:28:32,543 [Demetri] While the engineering crew 614 00:28:32,577 --> 00:28:35,412 work overnight to fix the sub, 615 00:28:35,447 --> 00:28:38,148 the scanning team have found stunning new data 616 00:28:38,183 --> 00:28:40,951 in the trench, revealing a second explanation 617 00:28:40,985 --> 00:28:44,655 for the devastating Indian Ocean tsunamis. 618 00:28:44,689 --> 00:28:45,956 - That's one there, right? - Yeah. 619 00:28:45,990 --> 00:28:48,826 I think it's a faulted seamount. 620 00:28:48,893 --> 00:28:52,096 [Demetri] A series of massive hills on the trench floor, 621 00:28:52,130 --> 00:28:54,665 extinct volcanoes known as "seamounts", 622 00:28:54,699 --> 00:28:57,901 that act like ticking time bombs. 623 00:28:57,936 --> 00:28:59,937 We've identified a number of seamounts 624 00:28:59,971 --> 00:29:02,773 that are in the process of being consumed 625 00:29:02,807 --> 00:29:05,909 in the trench axis of the Java Trench. 626 00:29:05,944 --> 00:29:08,545 [Demetri] The trench lies along a volatile seam 627 00:29:08,580 --> 00:29:09,713 in the earth's crust 628 00:29:09,748 --> 00:29:12,449 where two giant plates collide. 629 00:29:12,484 --> 00:29:15,285 Monumental forces are grinding one plate down 630 00:29:15,320 --> 00:29:16,487 under the other, 631 00:29:16,521 --> 00:29:18,922 and the seamounts are in the way. 632 00:29:20,792 --> 00:29:21,892 But that area there does look like 633 00:29:21,926 --> 00:29:23,227 that's created by the seamount 634 00:29:23,261 --> 00:29:24,361 being subducted under the plate. 635 00:29:24,395 --> 00:29:25,562 You can see how that is pushing there 636 00:29:25,597 --> 00:29:27,598 and energy is crushing the seamount itself. 637 00:29:27,632 --> 00:29:28,932 The areas around the seamount, 638 00:29:28,967 --> 00:29:30,901 it's subducting very, very slowly 639 00:29:30,935 --> 00:29:32,669 and it's stopped because the seamount 640 00:29:32,704 --> 00:29:34,138 has actually physically stopped 641 00:29:34,172 --> 00:29:35,339 the subduction process. 642 00:29:35,373 --> 00:29:37,608 [Victor] A massive underwater volcano 643 00:29:37,642 --> 00:29:39,476 - became a doorstop. - [Alan] Yeah. 644 00:29:39,511 --> 00:29:41,812 They can cause a sticking point 645 00:29:41,846 --> 00:29:45,616 and then ultimately there may be major earthquake 646 00:29:45,650 --> 00:29:47,951 or slip related to that sticking point 647 00:29:47,986 --> 00:29:50,721 and the pressure that is built up over time 648 00:29:50,755 --> 00:29:53,257 suddenly being released. 649 00:29:53,291 --> 00:29:54,525 [Demetri] A violent earthquake 650 00:29:54,559 --> 00:29:56,393 caused by one of these seamounts 651 00:29:56,427 --> 00:29:59,296 could in turn trigger a devastating tsunami, 652 00:29:59,330 --> 00:30:01,231 affecting the millions of people 653 00:30:01,266 --> 00:30:04,168 who live along the ocean's coastline. 654 00:30:04,202 --> 00:30:06,537 If Victor can reach the bottom of the trench, 655 00:30:06,571 --> 00:30:08,772 he could gather further crucial data 656 00:30:08,807 --> 00:30:11,809 to help predict earthquakes and tsunamis of the future. 657 00:30:13,111 --> 00:30:15,312 The topography of this area of the java trench 658 00:30:15,346 --> 00:30:17,881 has surprised us a bit, because we're seeing 659 00:30:17,916 --> 00:30:19,716 what I would call sharp features, 660 00:30:19,751 --> 00:30:21,552 things that seem to come out of nowhere, 661 00:30:21,586 --> 00:30:23,353 with some pretty steep drops 662 00:30:23,388 --> 00:30:25,422 or some pretty strong rises, 663 00:30:25,456 --> 00:30:29,626 so it seems to be a pretty active area seismologically. 664 00:30:29,661 --> 00:30:31,061 [Demetri] But after working overnight 665 00:30:31,095 --> 00:30:33,297 to solve the weight release issue, 666 00:30:33,331 --> 00:30:35,199 the engineering team have been hit 667 00:30:35,233 --> 00:30:37,835 by another mission-critical fault. 668 00:30:37,869 --> 00:30:39,937 [Kelvin] There was a little pump that wasn't running 669 00:30:39,971 --> 00:30:42,706 and that's the, uh, for going 670 00:30:42,740 --> 00:30:44,208 for when you come back to the surface 671 00:30:44,242 --> 00:30:45,709 pumping that water out, 672 00:30:45,743 --> 00:30:47,010 give you some buoyancy 673 00:30:47,045 --> 00:30:47,911 and for when you leave, 674 00:30:47,946 --> 00:30:50,480 it will helps you go down. 675 00:30:50,515 --> 00:30:53,150 [Frank] Constantly trying to keep a running tab 676 00:30:53,184 --> 00:30:55,786 of everything so that nothing gets missed. 677 00:30:55,854 --> 00:30:56,987 Cause I'm very tired. 678 00:30:57,021 --> 00:30:58,488 We're all very tired. 679 00:30:58,523 --> 00:31:00,924 [Kelvin] Come up, just wait, just wait. Come up. 680 00:31:00,959 --> 00:31:02,926 [Demetri] Can they fix the new problem 681 00:31:02,961 --> 00:31:05,562 before the cyclone ends the expedition? 682 00:31:05,597 --> 00:31:08,465 [Frank] We got a red light now we didn't have earlier. 683 00:31:11,469 --> 00:31:13,003 We get this done we can [bleep] 684 00:31:13,037 --> 00:31:14,972 get out of this [bleep] forsaken place! 685 00:31:23,281 --> 00:31:25,649 [Demetri] The engineering team are under pressure 686 00:31:25,683 --> 00:31:28,185 to turn the sub around for a second attempt 687 00:31:28,219 --> 00:31:30,888 on the deepest point of the Indian Ocean. 688 00:31:30,922 --> 00:31:32,723 [Kelvin] Yeah. It's fixed. 689 00:31:32,757 --> 00:31:34,124 Yup, problem solved. 690 00:31:34,158 --> 00:31:37,094 [Demetri] At last the sub gets the "all clear". 691 00:31:37,128 --> 00:31:39,696 The biggest trick was trying to figure out what went wrong, 692 00:31:39,731 --> 00:31:41,632 but we worked it out, 693 00:31:41,666 --> 00:31:42,900 and we are throwing her back together. 694 00:31:42,934 --> 00:31:44,034 Good timing. 695 00:31:44,068 --> 00:31:46,236 [Kelvin] Roll her in. 696 00:31:46,271 --> 00:31:49,439 [Frank] Brand spanking new. 697 00:31:49,474 --> 00:31:50,874 Yeah. 698 00:31:50,909 --> 00:31:53,710 [Demetri] The team release a first underwater probe 699 00:31:53,745 --> 00:31:57,047 codenamed "Skaff" to drop to the deepest point 700 00:31:57,081 --> 00:31:58,448 of a narrow sinkhole, 701 00:31:58,483 --> 00:32:01,985 and act as Victor's target. 702 00:32:02,020 --> 00:32:05,555 [Alan D.] Okay, it's good to go. 703 00:32:05,590 --> 00:32:08,392 [Demetri] They also drop a second probe a mile away 704 00:32:08,426 --> 00:32:11,895 outside the sinkhole to gather additional data. 705 00:32:19,437 --> 00:32:23,206 [Patrick] Okay, Victor. Ready for you. 706 00:32:23,241 --> 00:32:24,441 [Tim] Shall see you on the other side. 707 00:32:24,475 --> 00:32:25,742 [Victor] See you on the other side, Tim. 708 00:32:25,777 --> 00:32:27,210 Thanks, man. 709 00:32:27,245 --> 00:32:28,278 [Patrick] All start, here we go. 710 00:32:28,313 --> 00:32:31,181 We are getting the tow line off first. 711 00:32:31,215 --> 00:32:34,117 [radio voice] Excellent detachment, gentlemen. 712 00:32:34,152 --> 00:32:37,554 Okay. Here we go! 713 00:32:37,588 --> 00:32:39,556 [Demetri] With the threat of a tropical cyclone 714 00:32:39,590 --> 00:32:41,258 hanging over the expedition, 715 00:32:41,292 --> 00:32:43,060 this could be Victor's best chance 716 00:32:43,094 --> 00:32:44,594 to complete his mission, 717 00:32:44,629 --> 00:32:46,997 and gather fresh evidence from the ocean's 718 00:32:47,031 --> 00:32:48,865 deadly tsunami trigger zone. 719 00:32:52,337 --> 00:32:55,372 So we've got a nice descent rate going. 720 00:32:55,406 --> 00:32:58,909 These are places that since the dawn of time, 721 00:32:58,943 --> 00:33:01,078 no one's been there 722 00:33:01,112 --> 00:33:02,612 and I'm going to see for the first time. 723 00:33:06,517 --> 00:33:08,585 [Demetri] It's now been nearly three hours 724 00:33:08,619 --> 00:33:12,356 since Victor left the surface. 725 00:33:12,390 --> 00:33:14,791 If we've dropped him in the right spot, 726 00:33:14,826 --> 00:33:16,526 you know, he should be pretty close 727 00:33:16,561 --> 00:33:18,895 to right over the target site. 728 00:33:18,930 --> 00:33:20,897 All stations, be advised coming up 729 00:33:20,932 --> 00:33:22,299 to the quarter hour comms check. 730 00:33:22,333 --> 00:33:24,735 We do expect Victor is approaching the bottom. 731 00:33:28,106 --> 00:33:29,506 [Victor] I can see the bottom on my display. 732 00:33:29,540 --> 00:33:33,410 20 meters to go. 733 00:33:33,444 --> 00:33:37,147 Seafloor is starting to come into view. 734 00:33:37,181 --> 00:33:40,951 Coming very clearly into view now. 735 00:33:40,985 --> 00:33:43,353 Brown and speckled. It looks like a desert floor. 736 00:33:48,226 --> 00:33:49,459 Wow! 737 00:33:54,165 --> 00:33:56,733 Surface, surface, LF. 738 00:33:56,768 --> 00:34:00,103 At bottom. At bottom. 739 00:34:00,138 --> 00:34:01,738 Roger LF. 740 00:34:01,773 --> 00:34:04,775 Understand, on the bottom. 741 00:34:04,809 --> 00:34:06,410 That was a lot of hard work. 742 00:34:10,248 --> 00:34:12,682 [Demetri] Victor may be on the sea floor, 743 00:34:12,717 --> 00:34:15,218 but to reach the deepest point of the Indian Ocean, 744 00:34:15,253 --> 00:34:18,388 he must find "Skaff", the underwater probe 745 00:34:18,423 --> 00:34:20,524 the team have dropped as his target. 746 00:34:20,558 --> 00:34:24,361 [Victor] Okay, Skaffy, where are you? 747 00:34:24,395 --> 00:34:26,263 [Demetri] Even at this extreme depth, 748 00:34:26,297 --> 00:34:28,432 in the pitch dark and crushing pressures, 749 00:34:28,466 --> 00:34:32,235 there is life at the bottom of the Indian Ocean. 750 00:34:32,270 --> 00:34:34,371 Amid a network of animal tracks, 751 00:34:34,405 --> 00:34:36,840 a sea pig, which can inflate its body 752 00:34:36,874 --> 00:34:39,176 with water to float from the seafloor 753 00:34:39,210 --> 00:34:40,444 like a balloon. 754 00:34:43,881 --> 00:34:45,148 A purple sea cucumber, munching its way 755 00:34:45,183 --> 00:34:47,584 through the sediment in search of nutrients. 756 00:34:49,387 --> 00:34:51,288 And one of its swimming cousins, 757 00:34:51,322 --> 00:34:53,557 drifting through the sub's lights. 758 00:34:57,428 --> 00:34:59,629 Victor can communicate with the probe 759 00:34:59,664 --> 00:35:01,665 to find out how far away it is, 760 00:35:01,699 --> 00:35:05,435 but not its direction. 761 00:35:05,470 --> 00:35:06,570 [Victor] Okay, when I went south, 762 00:35:06,604 --> 00:35:08,905 I got a little closer, 763 00:35:08,940 --> 00:35:11,007 west a little further. 764 00:35:11,042 --> 00:35:12,642 [Demetri] Without the two other probes 765 00:35:12,677 --> 00:35:14,744 to help triangulate his position, 766 00:35:14,779 --> 00:35:18,048 Victor's task will be far from easy. 767 00:35:18,082 --> 00:35:20,250 There's a current down here. 768 00:35:20,284 --> 00:35:22,052 I'm being pushed about a meter. 769 00:35:26,057 --> 00:35:29,092 Okay, come on, what is that all about? 770 00:35:29,127 --> 00:35:31,928 Come on, LF. 771 00:35:31,963 --> 00:35:34,030 It's like trying to find the Aegina 772 00:35:34,065 --> 00:35:36,733 docking component of the Gemini mission. 773 00:35:36,801 --> 00:35:40,303 I swear it feels just like that. 774 00:35:40,338 --> 00:35:43,607 Okay. Nothing on sonar. 775 00:35:43,641 --> 00:35:45,308 [bleep] 776 00:35:45,343 --> 00:35:47,777 It's gone further away. 777 00:35:47,812 --> 00:35:52,415 Surface, bearing please to Skaff. 778 00:35:52,450 --> 00:35:54,451 [radio chatter] 779 00:35:56,888 --> 00:35:58,188 [Patrick] He just transmitted. 780 00:35:58,222 --> 00:36:01,658 He was saying something. 781 00:36:01,692 --> 00:36:03,693 [radio chatter] 782 00:36:06,664 --> 00:36:09,933 What the [bleep] is that sound? 783 00:36:09,967 --> 00:36:12,702 [Demetri] If Victor doesn't locate the target probe, 784 00:36:12,737 --> 00:36:14,704 he will fail to complete his record attempt 785 00:36:14,739 --> 00:36:18,308 to reach the deepest point of the Indian Ocean. 786 00:36:18,342 --> 00:36:20,110 Where are you SKAFF? 787 00:36:20,144 --> 00:36:22,412 [Demetri] And after a near three-hour descent, 788 00:36:22,446 --> 00:36:24,781 and over two hours already spent searching, 789 00:36:24,815 --> 00:36:26,750 time is running out. 790 00:36:38,696 --> 00:36:41,498 [Demetri] Victor Vescovo is over 23,000 feet 791 00:36:41,532 --> 00:36:43,700 underwater in a small sinkhole, 792 00:36:43,734 --> 00:36:45,135 searching for the deepest point 793 00:36:45,169 --> 00:36:47,938 of the entire Indian Ocean. 794 00:36:47,972 --> 00:36:50,674 To keep his global deep-ocean mission on track, 795 00:36:50,708 --> 00:36:52,676 he must hunt for a target probe 796 00:36:52,710 --> 00:36:55,045 dropped in advance of his dive. 797 00:36:55,079 --> 00:36:57,214 But now he has lost communication 798 00:36:57,248 --> 00:36:59,049 with the expedition ship above, 799 00:36:59,083 --> 00:37:01,251 there's no one to guide him home. 800 00:37:01,285 --> 00:37:03,253 [Victor] Surface, surface, 801 00:37:03,287 --> 00:37:07,924 present depth 7345. 802 00:37:07,959 --> 00:37:10,961 [radio noise] 803 00:37:13,264 --> 00:37:15,899 [Patrick] Say again, say again. 804 00:37:15,933 --> 00:37:18,468 'Cause we may be on this shelf here. 805 00:37:18,502 --> 00:37:20,270 [Demetri] It seems the steep walls 806 00:37:20,304 --> 00:37:22,439 of the sinkhole are blocking Victor's signal. 807 00:37:22,473 --> 00:37:24,040 [Patrick] I'd like to relocate pressure drop 808 00:37:24,075 --> 00:37:27,711 to establish comms, back over the Op area. 809 00:37:27,745 --> 00:37:29,546 Okay, cap'n, we want to get the modem up 810 00:37:29,580 --> 00:37:31,047 and repositioned right away. 811 00:37:31,082 --> 00:37:32,616 [Stuart] Yeah. Bridge copy. 812 00:37:35,586 --> 00:37:38,655 [Frank] Modem's in the water. 813 00:37:38,689 --> 00:37:40,757 [Victor] Surface, LF, 814 00:37:40,791 --> 00:37:44,761 present depth 733 niner meters. 815 00:37:44,795 --> 00:37:47,197 [Rob] You can breathe out now. 816 00:37:47,231 --> 00:37:50,400 [Patrick] Roger LF, we have you loud and clear. 817 00:37:53,938 --> 00:37:55,739 [Victor] Should be dead ahead. 818 00:38:04,282 --> 00:38:05,649 I see you buddy. 819 00:38:08,653 --> 00:38:10,320 Oh, this is awesome. 820 00:38:10,354 --> 00:38:12,022 Going to sit down right next to you Skaff, 821 00:38:12,056 --> 00:38:13,323 how about that? 822 00:38:18,396 --> 00:38:20,997 Touchdown. 823 00:38:21,032 --> 00:38:23,333 Ha! 824 00:38:23,367 --> 00:38:25,568 Bottom of the Indian Ocean, 825 00:38:25,603 --> 00:38:26,603 bottom of the Java Trench, 826 00:38:26,637 --> 00:38:30,440 first time in history, pretty cool. 827 00:38:30,474 --> 00:38:32,575 Surface LF, 828 00:38:32,610 --> 00:38:33,977 present depth, 829 00:38:34,011 --> 00:38:37,847 7342 meters. 830 00:38:37,882 --> 00:38:40,083 At Skaff. 831 00:38:40,117 --> 00:38:43,520 Repeat, at Skaff. 832 00:38:43,554 --> 00:38:45,855 [Patrick] Understand, you've found a spot, 833 00:38:45,890 --> 00:38:48,625 deeper than before, congratulations! 834 00:39:01,405 --> 00:39:04,507 [Demetri] The underwater probe is teeming with life. 835 00:39:04,542 --> 00:39:07,610 Thousands of tiny crustaceans called Amphipods 836 00:39:07,645 --> 00:39:09,379 are feasting on the bait. 837 00:39:12,483 --> 00:39:15,385 These are the supreme scavengers of the seabed. 838 00:39:22,393 --> 00:39:24,994 And arriving to join the feeding frenzy 839 00:39:25,029 --> 00:39:28,565 is an overblown cousin, known as a "Supergiant". 840 00:39:29,867 --> 00:39:32,102 Its body has evolved to be large enough 841 00:39:32,136 --> 00:39:34,337 to discourage voracious predators. 842 00:39:39,377 --> 00:39:43,213 Then an unidentified luminous jelly-like creature 843 00:39:43,247 --> 00:39:45,348 comes tantalizingly close. 844 00:39:48,953 --> 00:39:51,154 Casting an ominous shadow. 845 00:39:55,926 --> 00:39:57,494 But the second probe, 846 00:39:57,528 --> 00:39:59,529 positioned a mile from the deep sinkhole 847 00:39:59,563 --> 00:40:01,531 and 2,000 feet higher up 848 00:40:01,565 --> 00:40:03,867 is filming an even more mysterious 849 00:40:03,901 --> 00:40:05,535 creature of the deep 850 00:40:05,569 --> 00:40:09,372 one that has never been seen by human eyes before. 851 00:40:14,578 --> 00:40:17,280 With a bulbous, gelatinous head, 852 00:40:17,314 --> 00:40:20,049 and trailing a long strand with what looks like 853 00:40:20,084 --> 00:40:21,951 a weight on the end, 854 00:40:21,986 --> 00:40:24,487 this is an entirely unknown species 855 00:40:24,522 --> 00:40:27,123 of a creature known as a "Sea Squirt". 856 00:40:28,626 --> 00:40:30,960 Only further study and sightings could reveal 857 00:40:30,995 --> 00:40:33,329 the secrets of its bizarre body. 858 00:40:38,002 --> 00:40:41,938 [Victor] Request permission to ascend. 859 00:40:43,374 --> 00:40:46,109 [Demetri] Victor has now completed the third dive 860 00:40:46,143 --> 00:40:48,978 of his epic five-deeps mission. 861 00:40:49,013 --> 00:40:51,681 Helping to unravel the mysteries of tsunamis 862 00:40:51,715 --> 00:40:54,484 that have devastated the Indian Ocean, 863 00:40:54,518 --> 00:40:56,953 and to achieve new insights into life 864 00:40:56,987 --> 00:41:00,757 on the extreme edge of our planet. 865 00:41:00,791 --> 00:41:02,725 [Stuart] We have a visual. 866 00:41:02,760 --> 00:41:04,994 Welcome back sir, we have you loud and clear. 867 00:41:05,029 --> 00:41:06,196 [Victor] Thank you. 868 00:41:10,334 --> 00:41:11,568 [Tim] Welcome back. 869 00:41:17,508 --> 00:41:19,409 [Victor] Seeing those creatures, 870 00:41:19,443 --> 00:41:21,277 seeing the dumbo at that depth 871 00:41:21,312 --> 00:41:22,712 and seeing this creature. 872 00:41:22,746 --> 00:41:24,147 [Alan] I've never seen anything like that. 873 00:41:24,181 --> 00:41:25,682 That's the weirdest thing I have ever filmed. 874 00:41:25,716 --> 00:41:26,950 [Victor] We're going to show people 875 00:41:26,984 --> 00:41:28,785 that there is a lot down here 876 00:41:28,819 --> 00:41:30,453 that we know nothing about.