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Close to the Edge (cave)
Close To The Edge is a significant cave in the Dezaiko Range of the Rocky Mountains in Canada. It is within Close To The Edge Provincial Park and Protected Area about 160km east of Prince George, British Columbia.
==Cave setting and form==
The 20m wide entrance to Close To The Edge is located in a cliff near the summit of an unnamed mountain, but is hidden by a natural rampart and thus only visible from the air. The entrance shaft is 255 m deep, by far the deepest in Canada, and often sports a 20m long overhanging icicle. This is followed by shafts of 32 m, 17 m, 7 m, 10 m, 10 m, 8 m, 9 m, 68 m, and 9 m, ending at a sump. The surveyed length of all passages only totals 967 metres, while its overall depth of 472 m makes it the third deepest cave in Canada. It is believed that the sump water reappears at Twin Falls Resurgence some 600 m below the entrance.
==Exploration==
The first recorded entrance sighting was in 1985 by cavers in a helicopter supporting a nearby expedition. The following year the cave was explored to a frozen mud and stone blockage at the base of the second pitch at a depth of 263 m. The blockage was removed in 1994 and exploration continued to a depth of 430m. A final exploration in 2001 discovered the sump at -472 m.
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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