Take an epic voyage over the remote island nation of New Zealand, the last habitable landmass to be discovered on the planet. No bigger than the state of Colorado, this small country offers an incredibly diverse landscape view that changes dramatically with each mile. From snow-capped mountains to sandy beaches, and from the glacier-carved Fiordland National Park to the crater lake of Mount Ruapehu, New Zealand is a land of extremes. It's a place where fire clashes with ice and people are always pushing the limits.
Palau has set up the world's first shark sanctuary-a California-sized marine zone where hunting these endangered predators is strictly prohibited. Can this tiny island-nation defend against a sophisticated army of poachers? Join the front lines to save one of the ocean's most cherished and endangered predators.
As temperatures hit minus 60 food becomes scarce, and animals such as foxes and hares shed their colourful coats to camouflage themselves in the snow. The end of winter heralds one of the world's greatest feeding frenzies as large ocean predators target the millions of fish who have found refuge in the Gulf of Alaska.
Dr Helen Czerski examines the hottest natural phenomena on the planet - lightning. Bolts of lightning five times hotter than the surface of the sun strike our planet over 3 million times every day - and yet we still know little about this deadly force of nature. Now, specialist photography is revealing how lightning travels through the air, high-speed cameras are unlocking the secrets of upward lightning that's triggered by our urban landscapes, and scientific expeditions are capturing rare images of intense electrical discharges over 80 kilometres wide.
In this episode, we find out more about the animals that have their feet firmly planted on or under the ground. How are their senses tuned to survive? What we see above the ground is only a small part of the natural world, a busy, complex web of life lies just beneath our feet.