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Hellhole is a large and deep pit cave in Germany Valley, eastern West Virginia. It is the 7th longest cave in the United States and is home to almost half of the world's population of Virginia big-eared bats. At 518 feet (158 meters), Hellhole is the deepest of several caves in the Valley.〔 〕 Hellhole has had a long and storied association with the National Speleological Society dating back to the creation of that organization in the early 1940s. Many basic caving techniques (e.g., the single rope technique) were developed in Hellhole's 154-foot (47 meter) entrance drop. ==Description== The only known entrance to Hellhole is a funnel-shaped pit entrance on the lower slopes of North Fork Mountain. Descent by rope through this spectacular and storied entrance shaft gives access to a vast chamber. From the time exploration began there in the 1940s, cavers have documented over of mapped passage in the Hellhole system. "Little Hellhole" is a well known pit deeper in the cave. Hellhole's passages are developed predominantly in a layer of limestone known as the New Market. This same limestone is of remarkable commercial quality and is the primary object of the nearby Greer Lime Company open pit mining operations. 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「Hellhole」の詳細全文を読む スポンサード リンク
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