Blue Holes, Caves & Caverns
Blue holes, while not exclusively a phenomenon of The Islands of The Bahamas, are found here in a greater number than anywhere else on earth. And, The Bahamas has the only known tidal blue holes in the world.
Whether inland or submerged in the sea, the incredible blue holes are a phenomenon created during several ice ages, when sea levels were 400 feet lower and The Bahamas was a great exposed limestone platform. Centuries of acidic rain water etched into the vast bank, creating circular depressions and other magnificent formations. Today, most blue holes are located in shallow water on the Great and Little Bahama Banks, while others are inland pools.
Diving The Blue Holes
Blue holes that are accessible to divers are sprinkled throughout The Bahamas. Some are cavern diving experiences and others are mile-long labyrinths, off limits to sport divers. Access to blue hole diving varies; some are controlled and monitored by the Bahamas National Trust. Entry to others is policed by local organizations.
Although some unique organisms are found in blue holes, the attraction here is chiefly geological: experiencing a spectacular visual realm seldom seen by other human beings. The greatest concentration of blue holes is found both inland and in the shallows of Andros Island, where more than 50 blue holes have been recorded. Other concentrations of blue holes occur on and off Grand Bahama Island (Ben's Cavern, for example), The Exumas and Eleuthera & Harbour Island. One of the world's deepest blue holes is located on Long Island and is surrounded on three sides by land. A few well-known blue holes are located in Nassau, Bimini, and scattered throughout some of the other islands.