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Pwll-y-Cwm, Pwll y Cwm, Clydach Pothole


NGR: SO 21487 12438
206 m.asl

Monmouthshire , Northern Outcrop - East (Morlais to Abergavenny)
map using leaflet map:
Estavelle
Access Situated in the Clydach Gorge in the bed of the river near Elm Hole.
Description Accessible only to divers, providing access to the submerged passages leading to Daren Cilau's terminal sump. It may also provide a way into the main drain from Agen Allwedd.
History Underwater choke passed by Duncan Price in 1993; he and Rick Stanton dived through to Gloom Room Sump in Daren Cilau, 1994
Hydrology Resurgence for the water from the Llangattock caves. Tests
Conservation SSSI: 80 Mynyddoedd Llangynidr a Llangatwg, Cefn yr Ystrad a Chomin Merthyr (Mixed) GCR: 554
Gallery

Alan Bowring
2024
Clydach in extreme flood

Martin Laverty
2023
Red/brown water welling up into grey/green river in flood

Martin Laverty
2022
Normal, clear water flows

Martin Laverty
2025
A diver submerges...

Brendan Marris
2008
Low flow conditions
Survey
CSS & CDG, Descent 115
References
Descent 115
Caves of South Wales, Stratford, T., 1995
A Caver's View of the Clydach River (Cwmbran Caving Club, 1986), Schuurmans, T.
Martyn Farr, Darkworld (1997)
Chelsea SS nl.53 (5/6), 2011, p.35, Duncan Price, Fatality at Pwll-y-Cwm
Cambrian Cave Registry entry 833
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