Green turtles laying eggs on Raine Island

The final film in the series reveals how the reef is crucially connected to the rest of the planet - and how climate change will affect it's future.

From turtles that migrate thousands of miles across the Pacific Ocean, to whales travelling here each year from the Antarctic, creatures cover vast distances to visit the reef.

Australia's Great Barrier Reef is an icon, one of the natural wonders of the world and the largest living structure on our planet. Stunningly produced by the BBC and narrated by Karl Stefanovic, this fascinating series explores the full 2000 kilometre length of the Great Barrier Reef, capturing all the magic, from its immense scale to the most intimate detail.