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Sheck Exley (April 1, 1949 – April 6, 1994) was an American cave diver. He is widely regarded as one of the pioneers of cave diving, and he wrote two major books on the subject: ''Basic Cave Diving: A Blueprint for Survival'' and ''Caverns Measureless to Man''. On February 6, 1974, Exley became the first chairman of the Cave Diving Section of the National Speleological Society. During his career, he established many of the basic safety procedures used in cave and overhead diving today.〔 Exley was also a pioneer of extreme deep scuba diving. For purposes of rescue during cave diving, Exley helped standardize the usage of the "octopus", a redundant second stage diving regulator that can be used as a backup in the event the diver's primary second stage fails, or alternatively, to allow the diver and his buddy to have simultaneous access to the diver's gas if the buddy has an out-of-gas emergency.〔 The octopus is now considered an essential piece of equipment among virtually all scuba divers, whether caving or in open water. He died at age 45 while trying to set a depth record by diving the world's deepest sinkhole, Mexico's deep, Zacatón, a fresh water cenote.) In the book, ''Diving into Darkness'' (a story about Dave Shaw and Don Shirley), the author comments: "Exley's status in the sport is almost impossible to overstate". ==Early life and career outside of diving== Exley began diving in 1965 at the age of 16. That same year he entered his first cave and was hooked on cave diving for the rest of his life. To finance this passion, Exley worked as a mathematics teacher at Suwannee High School in Live Oak, Florida. 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「Sheck Exley」の詳細全文を読む スポンサード リンク
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