Neil Oliver begins a stunning journey through the world's largest coral reef in the hands of the Australian Navy, sailing in the wake of James Cook.
Brendan Moar uncovers the living history of Australia's hidden slave trade. Xanthe Mallett dives a spectacular wreck in search of answers about its calamitous sinking. And Tim Flannery is granted rare access to a scientific research zone to examine coral history.
On idyllic Lizard Isand, Neil Oliver uncovers a bloody tale of cultural misunderstanding. Finally, at the southern end of the Great Barrier Reef, Emma Johnston heads underwater with Google to take the reef into homes around the world.
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