The story of how more than 220 dinosaur bones were found in the Argentinean desert, which were found to have come from a previously undiscovered species, which is the largest land dwelling animal known to have existed. David Attenborough visits the archaeological dig and a laboratory where the remains are being cleaned and analysed with lead scientist Dr Diego Pol and evolutionary biologist Ben Garrod, and meets animators, model-makers, paleontologists and anatomy experts who are working to reconstruct what the 37 metre-long creature would have looked like.
58m • 2016
The fourth leg of the broadcaster's journey takes him from Oman to the Maldives. He starts in the Strait of Hormuz, where oil from the Gulf is shipped through the narrow channel, then moves on to Mumbai, the ocean's biggest port. In the Maldives, Simon finds arguably the most beautiful collection of tropical coral islands in the world - but the fragile underwater environment is a barometer for the changing nature of the sea, as he witnesses how bleaching has damaged the coral and one entire island has been manufactured as a landfill dump to deal with the problem of rubbish.
59m • Indian Ocean