A water-filled natural limestone cavern, Dean's Blue Hole plunges 663 feet below ground level on Long Island, part of a string of Bahamian islands south of Nassau and New Providence Island.
The Sansha Yongle Blue Hole is almost 1,000 feet deep, breaking the previous record of Dean’s Blue Hole in the Bahamas. Video courtesy of Reuters Follow TI: On Facebook More from Tech Scientists ...
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