Dean's Blue Hole is the world's deepest known blue hole with seawater. It plunges 202 metres (663 ft) in a bay west of Clarence Town on Long Island, Bahamas.
Dean's Blue Hole is roughly circular at the surface, with a diameter ranging from 25 to 35 metres (82–115 ft). After descending 20 metres (66 ft), the hole widens considerably into a cavern with a diameter of 100 metres (330 ft).
It is still unknown how Dean's Blue Hole was formed, as it is almost twice as deep as any of the other Blue Holes in the Caribbean that were formed when limestone chambers caved in from above. One hypothesis is that a much deeper cave slowed moved upward as its ceiling eroded away.
Some water-filled sinkholes are deeper than Dean's Blue Hole, Zacatón in Mexico (335 metres (1,099 ft)) and Pozzo del Merro in Italy (392 metres (1,286 ft) among them. Dean's Blue Hole though is the deepest known sinkhole with entrance below the sea level.
Some amazing photos of Dean's Blue Hole
and from Google Earth
And here is a video from the World champion freediver Guillaume Nery doing a special dive at Dean's Blue Hole.
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