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Dean's Blue Hole | Long Island, Bahamas


23° 6' 22.9824" N, 75° 0' 31.2588" W
Dean's Blue Hole

Dean's Blue Hole - Photo: Daan Verhoeven

Dean's Blue Hole is the world's deepest known blue hole with seawater. It plunges 663 ft (202 m) in a bay west of Clarence Town on Long Island, Bahamas.

In April 2010, William Trubridge broke a free-diving world record in the blue hole reaching a depth of 302 ft (92 m) without the use of fins (Constant Weight Without Fins). On 14 December 2010, he swam to a depth of 331 ft (101 m) on a single breath using only his hands and feet for propulsion.

Blue hole is a term which often is given to sinkholes filled with water, 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. The maximum depth of most other known blue holes and sinkholes is 360 ft (110 ft), which makes the 663 ft (202 m) depth of Dean's Blue Hole quite exceptional.

Dean's Blue Hole is roughly circular at the surface, with a diameter ranging from 82–115 ft (25 to 35 m). After descending 66 ft (20 m), the hole widens considerably into a cavern with a diameter of 330 ft (100 m).

Some water-filled sinkholes are deeper than Dean's Blue Hole, Zacatón in Mexico (1,099 ft (335 m)) and Pozzo del Merro in Italy (1,286 ft (392 m)) among them. Dean's Blue Hole though is the deepest known sinkhole with entrance below the sea level.

More infos: Wikipedia

Dean's Blue Hole

Dean's Blue Hole - Photo: Steve

Dean's Blue Hole

Dean's Blue Hole - Photo: acrestosea

Dean's Blue Hole

Dean's Blue Hole - Photo: hacdes55

Dean's Blue Hole

Dean's Blue Hole - Photo: Sergeant Zachary J. Foster

SUBMITTED ON 10.16.2013.