Coral Kingdoms

Undersea Edens: Coral Kingdoms

Off the coast of Australia's Heron Island lies the Great Barrier Reef, a 1,200-mile natural wonder, visible from outer space. This 6,000-year old underwater empire hosts myriad species of coral and holds some of the world's most iconic animals like clownfish, green sea turtles and barracuda. It also teeters on the brink of collapse. We investigate how manmade conditions have damaged one reef, but spawned another, courtesy of a sunken luxury liner that now serves as a vibrant, living memorial.

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Besides providing shelter, the coral reef employs many mechanisms to protect its inhabitants.