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Great Barrier Reef (Blu-ray).
Visible from space, the Great Barrier Reef is the largest living structure on our planet. Stretching just over 12 miles in length and made up of 3 individual reef systems and hundreds of islands, Australia's Great Barrier Reef is breathtakingly beautiful. Given world heritage status in 1981, it is one of the wonders of the natural world. This program offers a definitive guide to the secrets of the reef - how it was created, how it works, the intricate relationships between its inhabitants - and how climate change and other factors might shape its future. Using the latest filming techniques, the series captures the magic of the reef as it has never been seen before.