Dean's Blue Hole

Blue hole is a term for water-filled sinkholes with the entrance below the water level. They can be formed in different karst processes, for example, by the rainwater soaking through fractures of limestone bedrock onto the watertable. Sea level here has changed: for example, during the glacial age during the Pleistocene epoch (ice age), some 15,000 years ago, sea level was considerably lower.

Dean's Blue Hole is said to be the deepest blue hole in the world, and  the second largest underwater chamber. Experts at Reeldivers and  Vertical Blue, who have done dives at the site, report that: "It is enclosed on three sides by a natural rock amphitheatre, and on the fourth side by a turquoise lagoon and powder white beach. There is never any swell or waves inside the Hole, and visibility is usually between 50 - 100 feet (15 - 30m)."

 The Blue Hole dips some 663 feet (203 meters) into the ocean floor right off shore. At the surface it is 80 x 120 feet (25 x 35m), but opens out after 60 feet (20m) into a cavern with a diameter of at least 330 feet (100m).

 It is located west of Clarence Town, and is also the site where the Freediving World Record was set in April 2007.

Thanks to Source : www.geologypage.com


Nirupom Lahon
B.Sc. 3rd Semester