David Attenborough returns to his most magical place on earth... In 1957, Sir David Attenborough first visited and scuba dived on one of our planet's most extraordinary creations, the Great Barrier Reef. An array of animals such as the manta ray, the walking epaulette shark and the humpback whale have made the Reef their home. Shrouded in mystery and mostly inaccessible, Attenborough always wanted to go back to further explore the ecosystem he describes as "like no other in the natural world". Sixty years on, using brand-new technology and the latest scientific research, the world's most renowned naturalist dives down into uncharted waters to unlock the secrets of the Reef, embarking on a personal journey that reveals the true extent of its diversity, characters and complexity along the way.