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Jib Tunnel
Jib Tunnel, also known as Lateral Passage is one of the entrances into the Gaping Gill cave system, located behind a large boulder in the north bank of Fell Beck adjacent to Gaping Gill Main Shaft. Although short, it leads to Lateral Shaft, a direct descent into Gaping Gill Main Chamber which is a popular caving route, and has had considerable significance in the history of the exploration of Gaping Gill.
==Description==
A short wriggle between the shakehole wall and a large boulder leads into the roomy passage. After metres this abruptly drops to the floor of the Main Chamber. Although a direct descent is possible, a considerable waterfall enters from Spout Tunnel below the lip, so the modern route, known as ''Dihedral'', deviates away from this to land on a ledge some down. The route then leaves the shaft to drop down the rift above the Main Chamber, before emerging through the roof and dropping the final to the floor.〔
Spout Tunnel can be entered by swinging in from a rope or ladder. The passage becomes narrow, and after the main water enters down a pitch. Above this a further climb enters of passage which gets too small close to a sink in Fell Beck opposite Rat Hole Sink. Below the pitch a small passage continues for another , and is thought to drain the area just to the east of the blind valley.〔
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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