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Boesmansgat, also known in English as "Bushman's Hole", is believed to be the sixth-deepest submerged freshwater cave (or sinkhole) in the world, having been dived to . It is located in the Northern Cape province of South Africa. Boesmansgat was believed to have first been explored by amateur diver Mike Rathbourne, in 1977. The lowest depth attained was by Nuno Gomes, in 1996. Its altitude of over makes this a particularly challenging dive, requiring a decompression schedule equivalent for a dive to feet at sea level. (Gomes' dive was a close call, as he got stuck in the mud on the bottom of Bushman's Hole for two minutes before escaping.) On 24 November 2004, Verna van Schaik set the Guinness Woman's World Record for the deepest dive with a dive to . == Deaths == *In 1993, Eben Leyden died after blacking out at .) *In 1994, while helping a team prepare for a dive, Deon Dreyer died on ascent at a depth of .〔 Dreyer's body remained in the cave until being discovered ten years later at a depth of by renowned cave diver David Shaw. *On 8 January 2005, David Shaw died while attempting to recover Dreyer's body. (Shaw's close friend and support diver, Don Shirley, nearly died as well and was left with permanent damage that has impaired his balance.) On 12 January 2005, Dreyer and Shaw's bodies were ultimately recovered, while part of the staff was recovering part of the technical equipment. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Boesmansgat」の詳細全文を読む スポンサード リンク
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