Extreme Diving By Guillaume Néry

Guillaume Néry (born 11 July 1982) is a French free-diver specialised in Constant Weight free-diving. He broke the world record in 2002 at -87 meters in the Villefranche-sur-Mer harbour, in Alpes-Maritimes, France. Then, in 2004, he pushed the record to -96 meters in Saint-Leu, la Réunion. On September 6, 2006, he broke the record again at -109 meters in Nice (this record was subsequently broken by Herbert Nitsch at -112 meters in November 2007). On July 3, 2008, he dove to -113 meters and set a new world record.
Dean's Blue Hole is the world's deepest known blue hole, or underwater sinkhole. It plunges 202 metres (663 ft) in a bay west of Clarence Town on Long Island, Bahamas. Blue holes are the results of rainwater having soaked through fractures of limestone bedrock onto the watertable of glacial sea levels during the Pleistocene epoch (ice age), some 15,000 years ago. The maximum depth of most other known blue holes and sinkholes is 110 metres (360 ft), which makes the 202 metres (663 ft) depth of Dean's Blue Hole quite exceptional.