Devil's Hole, Bermuda
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Devil's Hole is a large water-filled sinkhole close to the southeastern corner of Harrington Sound, Bermuda. At one time a subterranean ocean cave, it is fed by the Atlantic Ocean rather than the far closer sound, via an underground estuary.
The hole got its name after the cave roof collapsed. The resultant open hole produces eerie sounds as the water rises and falls, which were thought by superstitious early settlers to be the Devil moaning.
It has been a tourist attraction since the 1830s, as it forms a natural tropical aquarium. Species range from Green Turtles to Moray Eels, and many species of reef fish can be found.