| Ogof Ffynnon Ddu 1 (Cave)
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| Location | SN 84800 15300. Northern Outcrop - Central (Penwyllt to Penderyn), Powys | Updated |
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| Elevation (m) | 204 | Length (m) |
75000 | ||
| OS Map No. 1:50000 |
160 | 1:25000 |
OL12 | 1:10000 |
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| Access | This is one of the 3 entrances to Ogof Ffynnon Ddu. The cave is a Nature Reserve and Access is controlled by the OFD Management Committee and administered by SWCC. A permit for entry should be applied for from the SWCC permit Secretary. Parties wishing to enter OFD 1 must have a leader who is recognised as a leader for the system. See the Access page of the Cambrian Caving Council Website for current Access arrangements at http://www.cambriancavingcouncil.org.uk/cave_access.html |
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| Description | OFD 1 Entrance is not the original entrance to OFD, but a slightly newer one dug to bring the entrance on what was Cyril Powell's land. OFD is the deepest cave in Britain and the third longest, and ranks amongst the longest caves in the world. The cave comprises of a complex system of large and small fossil passages, finely decorated in places and a fine and very long streamway. It is divided into four distinct sections : OFD 1, Cwm Dwr, OFD 2 and OFD 3 The length of OFD 1 is around 6000 metres. A complex series of passages in the entrance lead to an active passage from which at various points further passages can be reached. The stream is liable to flood. Divers proved the connection to OFD 2 in 1966 and to Cwm Dwr in 1967 and Top Entrance was dug open in 1967. Vertical Range - 308 metres |
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| Bibliography | This Bibliography will need considerable research to update and complete it. BOC Bulletin 2 (12), 80-85, 1951. Rescue British Caver 3 1938, 81-86 Report on original exploration of Cwm Dwr and survey British Caver 15 1946, 37-39 & 43 British Caver 15 1946, 80-87 Early exploration and Survey British Caver 15 1946, 99 Early exploration British Caver 16 1947, 52-55 Diving British Caver 16 1947, 56 British Caver 16 1947, 76-77 Discovery of Human Skeleton British Caver 16 1947, 78-81 Discovery British Caver 16 1947, 88-91 British Caver 17 1947, 95-103 British Caver 18 1948, 88-90 British Caver 22 1951, 16-17 Preservation of fauna and flora British Caver 22 1951, 68-69 British Caver 22 1951, 68-69 British Caver 22 1951, 68-69 British Caver 22 1951, 68-69 British Caver 22 1951, 70-75 Rescue British Caver 22 1951, 76-78 British Caver 22 1951, 91-95 Rescue British Caver 25 1951, 84-5 Access Cave Science 3 (18), 107-8 1951. Rescue CDG Newsletter 5, 1-13, 1946 CDG Report (1/46), 1946. Diving at the Rising CDG Report (5/46), 1947. Diving opportunity at the rising CDG Review 1961 Diving CDG Transactions 1, 13-20, 1948. Cave formation and survey CRG Newsletter 15, 2-4, 1948. Water tracing from Pwll Byfre CRG Newsletter 16, 4-5, 1948. Geology CRG Newsletter 22, 5-6, 1949. Air beneath calcite gours CRG Newsletter 35, 15-16, 1951. Observations on being trapped. CRG Newsletter 41, 4-5, 1952. Hydrology CRG Newsletter 48, 13-14, 1954. Details of climbs CRG Pun. No.6 Ogof Ffynnon Ddu. C.L. Railton. CRG Transactions 1 (1), 1-47, 1950. Cave formation and survey CRG Transactions 2 (2), 135-48, 1952. Description and discussion on significant air currents. HCC Newsletter 2, 7-8, 1951 Jenkins, D.W. & Williams, A.M. Caves of Wales and the Marches. Dalesman. 1st Ed.1963, P35, 26 Limestones and Caves of Wales, 1989 Stratford, T. Caves of South Wales. 1995 SWCC Newsletter , 1951. Discovery of Escape Route SWCC Newsletter , 1954. Access SWCC Newsletter 13, 1955. Note on start of dig at Cwm Dwr SWCC Newsletter 16, 1956. Electromagnetic Survey SWCC Newsletter 19, 8, 1957. Extension to Rawl Series SWCC Newsletter 20, 1-4, 1957. Investigation of airborne bacteria SWCC Newsletter 20, 4-5, 1957. Mud Sump SWCC Newsletter 21, 8, 1957. Whiskey Aven connection to R-W Series SWCC Newsletter 21, 3-7, 1957. History of early exploration and survey of Cwm Dwr SWCC Newsletter 23, 2-5, 1958. Discovery and description of extension with Grade 4 Survey SWCC Newsletter 23, 5-6, 1958. Digging on Boulder Series SWCC Newsletter 24, 17-19, 1958. Rescue SWCC Newsletter 24, 20, 1958. Medical note on rescue SWCC Newsletter 26, 3-6, 1959. Discovery of Coronation Aven Extension SWCC Newsletter 29, 7-9, 1959. Description of 3 dives SWCC Newsletter 33, 17-20, 1960. Details leading to rediscovery of Cwm Dwr SWCC Newsletter 34, 20-21, 1960. Boulder fall at entrance to Rawl series SWCC Newsletter 34, 7-11, 1960. Discovery, divers find a stream SWCC Newsletter 34, 12-14, 1960. Discovery of small extension & survey of Cwm Dwr SWCC Newsletter 35, 3-5, 1961. Diving in boulder series SWCC Newsletter 35, 18-22, 1961. Likely places to dig for way on in Cwm Dwr SWCC Newsletter 37, 9, 1961. Wireless contact in boulder series. SWCC Newsletter 6, 1953. Ascent of Bat Aven. Grade 2 Survey SWCC Newsletter 6, 1953. Discussion of many digs in boulder chamber SWCC Newsletter 7, 1954. Connection with Pant Canol WCC Circular 2 (30), 4-6, 1951. Rescue WCC Journal 4 (57), 85-86, 1956. Access WSG Bulletin 23, 2, 1953. Access YRC Journal 7 (23) 52-61, 1938. Early description |
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| Survey | SWCC 1969 Nyth Bran Series, SSS 1984 SWCC 1994 |
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| Found / Dug By | OFD 1 - SWCC 1946 OFD 2- 1966 by Divers OFD 3 - 1966 SWCC |
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| Copyright © Cambrian Caving Council 2008 |
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