Dr Chris and Dr Xand van Tulleken bring you the top experts on the planet to show you more things that will blow your mind! The scientists and explorers spend their last day at the berg. The science team try to work out how a mighty two-billion-tonne mega-berg melts and eventually disappears, explorer Andy Torbet creates an amazing and beautiful undersea spectacle and there's more bear trouble as the team head back to the iceberg. Show less