The Great Barrier Reef is the world's largest coral reef system. That, Wikipedia must have already informed you. And if you have been following the news, you might have read about the accidental dropping of four bombs by the US Navy in a joint training exercise gone wrong. Thankfully, the bombs were unarmed and did not explode. This is not the first of accidents; in 2010, a Chinese ship ran aground in the reef, causing an oil spill.
The Great Barrier Reef Marine Park, which lies off the coast of Queensland, Australia, was designated a UNESCO World Heritage Site in 1981. As many as 32 species of cetaceans -- whales, dolphins and porpoises -- have been identified as inhabiting the reef or using it as a migratory channel. Six species of globally threatened sea turtle -- the Green Sea Turtle, Leatherback Sea Turtle, Hawksbill Turtle, Loggerhead Sea Turtle, Flatback Turtle and Olive Ridley Sea Turtle.
Enjoy these images from Flickr, taken by Scuba divers who have experienced the enchanting undersea world of the Great Barrier Reef.