Documentary capturing some of the greatest filming sequences of David Attenborough's career, using previously unseen footage, from the deepest dives in a submersible on the Great Barrier Reef to watching a million bats take off in a cave in Borneo. Other highlights include life in the frozen tundra of South Georgia, a colony of King Penguins and the world's largest migration of Hammerhead sharks in the Galapagos Islands