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Devils Well
Devils Well is a sinkhole cave near Akers in the U.S. state of Missouri, containing an underground lake that is the largest in the state.〔http://www.news-leader.com/story/sports/outdoors/2015/07/01/eerie-devils-gets-first-look-decades/29559377/〕 It is a part of the Ozark National Scenic Riverways and can be viewed by the public any day during daylight hours. The U.S. Park Service has set up a metal staircase and a switch-activated light; however, it is recommended that visitors bring additional light sources.
== History ==
In 1954 the Devils Well was explored by the brothers Bill and Bob Wallace, using a bosun's chair attached by a steel cable to a hand winch. The distance from the entrance to the surface of the lake is a vertical drop of approximately 100 feet. The brothers measured the chamber containing the lake and found it to be 400 feet long and 100 feet wide. The cave also features several waterfalls of various heights.〔http://www.nps.gov/ozar/planyourvisit/loader.cfm?csModule=security/getfile&PageID=170913〕
In 1956 the geologist Jerry Vineyard entered the cave and observed two species of blind cave fish and a sculpin fish.〔http://www.news-leader.com/story/sports/outdoors/2015/07/01/eerie-devils-gets-first-look-decades/29559377/〕
The cave was entered on June 24 and 25, 2015, by five members of the Cave Research Foundation. The goal of this exploration was threefold: to ensure the stability of the current metal viewing platform, to assess the state of the lake and cave life, and to demonstrate that current equipment and methods would allow for the cave to be more thoroughly explored. As a result of this expedition, it was learned that waterproof two-way radios did not function well. In addition, two species of cave crayfish were identified: the southern cave crayfish (''Orconectes australis'') and the Salem cave crayfish (''Cambarus hubrichti'').〔http://www.news-leader.com/story/sports/outdoors/2015/07/01/eerie-devils-gets-first-look-decades/29559377/〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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