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Stunning look at Dean's Blue Hole in the Bahamas, which is the world's deepest sea-hole at 663-feet.

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" The Great Blue Hole, Belize " It was formed as a limestone cave system during the last glacial period when sea levels were much lower. As the ocean began to rise again, the caves flooded, and the roof collapsed.Believed to be the world’s largest feature of its kind, the Great Blue Hole is part of the larger Belize Barrier Reef Reserve System

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The Blue Cave, Croatia. Off the coast of Korcula, one of Croatia’s biggest islands is Modra Spilja (the Blue Cave).

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