A sense of danger and intrigue fill the divers as they descend into the unusual waters of the blue hole.
“Fifty feet from the surface looms a pale haze, less smoky than fibrous, like a silvery net of faint, swirling cobwebs hovering motionless in the darkness. It’s a layer of hydrogen sulfide, a toxic gas created by bacterial colonies and decaying organic matter. Divers entering the gas may experience itching skin, tingling, or dizziness; some smell rotten eggs as it penetrates their skin and metabolizes through their lungs. is a submarine cave or underwater sinkhole. They are also called vertical caves.”
There are many different blue holes located around the world, from Belize and the Bahamas to the Red Sea.Blue holes are roughly circular, steep-walled depressions formed during the last ice age. The center of the hole is deep filled with dark blue waters and surrounded by the lighter blue of the shallows. Their water circulation is poor, so oxygen supply is low so most sea life is low, but large numbers of bacteria can easily thrive in this environment.
The deepest blue hole in the world at 202 meters (663 ft) is Dean’s Blue Hole, located in a bay west of Clarence Town on Long Island, Bahamas.
Scientists now think these blue holes may hold
Check out the beautiful blue hole images at National Geographic Magazine online.
Reference
Excerpts courtesy of http://bit.ly/aFLAU3
Excerpts courtesy of http://bit.ly/9fhlZA
Image courtesy of http://bit.ly/cmaY0A
Nature's Crusaders 
Leave a comment