Mossdale Caverns
| Mossdale Caverns | |
|---|---|
Mossdale Scar
|
|
| Location | Yorkshire Dales |
| Coordinates | 54°07′25″N 1°58′36″W / 54.12361°N 1.97667°W |
| Depth | 76 m (249 ft) |
| Length | 10.5 km (6.5 mi) |
| Discovery | 1941 |
| Geology | Carboniferous limestone |
| Entrances | 1 |
| Difficulty | Grade 5 |
| Hazards | Flooding |
| Access | not granted |
| Cave survey | Online ULSA survey |
Mossdale Caverns is a cave system in the Yorkshire Dales, England. It is located about 5 kilometres (3.1 mi) north of Grassington, and east of Conistone, where Mossdale Beck sinks at the base of Mossdale Scar. It lies at an altitude of 425 metres (1,394 ft) on the eastern flank of Wharfedale, and extends south-east beneath Grassington Moor.
The cave system is formed within the Middle Limestone of the Yoredale Series. The large stream (average flow 100 litres/second) has been shown by dye testing to resurge at Black Keld, some 4.4 kilometres (2.7 mi) to the WNW 225 metres (738 ft) lower.
Exploration of Mossdale Caverns was begun in 1941 by Bob Leakey of the British Speleological Association. It is a very flood-prone challenging cave system, with many of its passages involving long wet crawls. Other sections have neck-deep water and many of Leakey's explorations were conducted solo as few of his contemporaries had the necessary endurance. The end was finally reached again in 1964 by Mike Boone and Pete Livesey. A return trip to the far end takes between eight and ten hours.
Permission to enter the caves is no longer granted because of the tragedy that occurred in 1967. Exploration does still take place, but on an unofficial basis. It is thought that the cave system may hold the key to breaking into the Great Scar Limestone and the extensive cave that exists behind Black Keld.
The cave system is notorious amongst cavers in the United Kingdom for a tragedy that occurred on 24 June 1967. On that day, ten cavers entered the system. Three hours later, four members of the party decided not to continue and exited the cave system. One of these four returned to the entrance shortly afterwards, only to find it completely submerged due to recent rainfall having swollen Mossdale Beck. Realising immediately that the six cavers who remained inside the cave system were in danger, she ran 4 kilometres (2.5 mi) across the moor to raise the alarm.
Cave Rescue teams arrived at the scene, but the high water levels prevented access to the cave. The waters of Mossdale beck had to be diverted away from the cave entrance by digging a trench. Even then the rescue operation could not be started because of the high internal water levels.
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Wikipedia