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When David Attenborough first visited the Great Barrier Reef in 1957, he considered it the most spectacular place in the natural world, and he assumed that it would last forever. Since then the coral has been dying at an unprecedented rate. In this episode, he undertakes his most important mission to understand what the next few decades hold for this remarkable community of animals, as well as what is being done to save it.

On his journey, David uncovers the remarkable ways in which scientists are trying to preserve the reef and embarks on an ambitious exploration of his own, the deepest dive ever on the reef. But despite the discoveries now being made by scientists and in the reef's furthest reaches, David fears for the future of this incredibly complex and beautiful ecosystem so vital for the world's oceans.