L:32500
V:160

Agen Allwedd, Keyhole Cave, Aggie, Aggie Aggy


NGR: SO 18769 15860
358 m.asl

Powys , Northern Outcrop - East (Morlais to Abergavenny)
map using leaflet map:
Cave
Access Follow the tram road from Pont-y-Rhiw to the end. There is a small entrance in the left hand corner up on a ledge. The main entrance is through Ogof Gam. A permit to enter must be obtained. Current Access arrangements
Description One of the longest caves in Britain. A great deal of its length is made up of long sections of streamway and large mainly dry passages. Has several lengthy round trips which make it a popular destination for cavers.
History SWCC 1946. Main extensions HCC, 1957. Eldon Pothole Club 1972. CDG 1966-74 Remembrance Series.
Hydrology Outlet of pool between Waen Rudd and big gully feeds Stream Passage in Entrance Series very quickly...; Swiss Passage to Draught Passage proved with Rhodamine B in 1961; Cliffs of Dover via Trident to 1st inlet on left in Southern Stream; St Pauls via Shamrock to Midsummer (I.Homes, SWCC nl 46,p.14); Water below Keyhole Chamber has been dye tested from Pwll Y Gwynt in less than 5 hours
Conservation
SSSI: 0080 Mynydd Llangatwg (Mixed) GCR: 554
Survey
HCC, 1959. HCC (1960)CSS Records 1992
WCC Jnl 108 (1966) Turkey Sump
BCRA, Ian Penney, 1977
Descent 56 Northern Stream Passage
Descent 58 Shattered Passage - 1984 Series
GSS nl Jun 1991, Africa Seies
CSS nl 56(11), p.105, Upper Lower Southern Stream
CSS nl 57(1), p.18, Upper Keyhole
CSS nl 57(10), p.98, Recharge
References
Cullingford, C.H.D. (1951) Exploring Caves,pp.66-68
SWCC nl 46, pp.10-11, 1963, Inett Homes, The Dam Busters [Ramblers release dam at pool between Waen Rudd and big gully: and underground party note stream rises and turns blackish brown]
WCC Jnl 108 (1966) Diving in Agen Allwedd
HCC nl, pp.???, 1967, Midnight Passage sediment and Varves ?
Cave Projects Group nl.1 Jan 1970, Agen Allwedd
HCC 21st Anniversary Publication, pp.7-43, 1973, David E.Leach, Review of Speleogenesis of Agen Allwedd
BCRA Transactions 2(1), pp.35-40, 1975, Peter A.Bull, Birdseye structures in caves
BCRA Bulletin 15, pp.9-10, A.C.W., Notes on the updated survey of Agen Allwedd
Trans BCRA 6(2), pp.85-92, 1979, Mark Noel, Peter Homonko, Peter Bull, The palaeomagnetism of sediments from Agen Allwedd, Powys
Trans BCRA 8(3), pp.178-187, 1981, Mark Noel, W.G.Retallick, Peter A. Bull, Further palaeomagnetic studies of sediments from Agen Allwedd
Descent 56, pp.8-12, 1984, Clive Gardner, Northern Stream Passage
Descent 58, pp.12-13, 1984, Hedgehog Passage find - but a sting in the tail [high level oxbow to Turkey Streamway]
Descent 58, pp.14-17, 1984, Martyn Farr, Aggy reveals more secrets! [Shattered Passage - 1984 Series]
GSS nl Jun 1987, p.6, Simon Witt, The Gothic Passage Dig
GSS nl Oct 1987, pp.1-7, Simon Witt, Gothic Passage Extensions
CaC 36, pp.27-28, 1987, Duncan Price, Resurrection Series
CaC 36, pp.29-32, 1987, S Tomalin, Extensions in Gothic Passage (The G.S.S. Extensions)
GSS nl Apr 1988, pp.4-7, Mike Green; Jonathan Maisey, Aggy - Gothic Passage - Glevum Hall
GSS nl Apr 1988, pp.16-17, Mike Green; Steve Tomalin, Agen Allwedd - Gothic Passage (Recent extensions)
GSS nl Oct 1989, pp.12-13, Jonathan Maisey, Gothic Passage
GSS nl Oct 1990, pp.3-4, Mike Green, Ace of Spades/North Wing: two new (small) circles in Aggy
GSS nl Oct 1990, p.6, John Holme, Agen Allwedd reveals more
GSS nl Jun 1991, pp.8-11, J.Holme; J.Maisey; P.Hogan; M.Green, Africa Series - Agen Allwedd
Caves of South Wales, Stratford, T. , 1995
A Caver's View of the Clydach River (Cwmbran Caving Club, 1986), Schuurmans, T.
Proc.UBSS 23(1) pp.51-66, 2003, Helen M.Dewar; David A.Descent 188, p.19, Martyn Farr, Aggy's advancesRichards, An investigation of the karst drainage network of Agen Allwedd
Descent 179 p.12, Aggy to Daren: the connection hopes rise
Descent 188, p.19, Martyn Farr, Aggy's advances [Trafalgar]
Descent 188, pp.20-22, Tom Foord, The Courtesan beckons
Descent 203, pp.30-31 (2008), Researching cave radon
CaKS v34(2), pp.69-76, 2006, Michael J.Simms and John B.Hunt, Flow capture and reversal in the Agen Allwedd Entrance Series, south Wales: evidence for glacial flooding and impoundment
GSS nl Jan 2011, pp.13-14, Joe Duxbury, Agen Allwedd - Midnight Passage
CSS nl 55(7/8) pp.58-59, 2013, John Stevens, Muddy Waters [Cascade Inlet, Crochan Sion Hopkin, Cascade Sink, water temperatures]
Descent 206, p.18, Martyn Farr, Aggy's North Wing
Descent 211, p.15, Martyn Farr, Agen Allwedd's North Wing
Descent 218, p.16, Martyn Farr, Digging North Wing
CSS nl 56(11), pp.104-105, John Stevens, Another small find in Agen Allwedd
CSS nl 57(1), pp.10-18, John Stevens and Mike Green, Keyhole Chamber Extensions
CSS nl 57(10), pp.97-98, John Stevens, More climbing in Agen Allwedd [above Midsummer Passage]
Brendan Marris Caves of South Wales
Cambrian Cave Registry entry 809
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