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Rumbling Hole
Rumbling Hole is a cave on Leck Fell, in Lancashire, England. Its entrance is a deep fenced shaft, and it rapidly descends a series of pitches to a low aqueous passage that has been connected to Lost Johns' Cave. It is part of the Three Counties System, an cave system which spans the borders of Cumbria, Lancashire, and North Yorkshire.
==Description==
The entrance shaft descends some , and the way on is through the water descending from Rumbling Beck Cave above into a fault passage. Four further pitches descend into a chamber to a low canal passage. Upstream gets too low after some 60 metres, but downstream has been forced round some awkward bends and through some ducks into Rumbling Hole Inlet in Lost Johns' Cave. This section of cave is about long.
An alternative route begins from a passage entered a few metres below the west end of the entrance shaft. These passages are, in the main, tighter and more complex than the main route, but the main passage descends an alternative set of pitches to a sump which is believed to be the upstream sump of the inlet canal at the end of the main route. This set of passages, known as the Dead Dobbin Series is about long.
Rumbling Beck Cave is the source of the water which enters the entrance shaft below the surface at the east end. The normal entrance is where the stream sinks east of the Rumbling Hole. The main passage starts off as a crawl, but develops into a trench before reaching the shaft. A roof passage starting some from the end leads to an alternative window in the shaft. Rumbling Beck Cave is about long.〔
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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