|Location||Charterhouse, Somerset, UK|
|Depth||175 metres (574 ft)|
|Length||16.5 kilometres (10.3 mi)|
|Altitude||213 metres (699 ft)|
|Cave survey||Geological Conservation Review/UBSS|
It is 1.65 km in length and reaches a depth of 175m.
The picture shown is not Longwood Swallet, it is Longwood Valley Sink. Longwood Swallet's entrance is a lidded concrete block construction. A (non-free) picture of Longwood Swallet entrance is available here
The cave is locked and access is controlled by the Charterhouse Caving Company. There is a warning sign posted at the entrance to the cave about flooding. This has always been a problem, but is more pronounced due to the extraction of water from the spring at Charterhouse. When the pumps owned by Bristol Water stop this can cause a flood wave to travel down the stream and into the cave.
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