Ogof Ffynnon Ddu (Welsh for cave of the black spring), also known informally as OFD, is a cave under a hillside in the area surrounding Penwyllt in the Upper Swansea Valley in South Wales. It is the second longest cave in Wales and the deepest in the United Kingdom.
OFD was discovered in 1946 through digging by Peter Harvey and Ian Nixon, members of the newly formed South Wales Caving Club.[3] Exploration beyond the Boulder Chamber in 1957 revealed passages as far as the Dip Sump. Major extensions were discovered in 1967 through to Cwm Dŵr, which is now known as OFD2. The system is famous for its intricate maze-like structure and its impressive main stream passage.[4]
It is now part of the Ogof Ffynnon Ddu National Nature Reserve, which includes the ruined remains of a former brickworks, including several kilns, quarry workings and tramroad tracks. The terrace of workers' cottages is now occupied by the South Wales Caving Club.[5]
The cave has seen many minor incidents resulting from people getting lost or tired, or surprised by flooding, and various accidents such as falls which are handled by volunteer cave rescue teams who are alerted by the police. More prolonged rescues have included:
In 1951, before cave rescue was well established, "two well-known members of the South Wales Caving Club, Lewis Railton and W.H.Little, made their way into the huge cave that bears the Welsh name of Ogof-Y Ffynnon Ddu (Cave of the Black Well or Stream) in South Wales...[when] swirling water cut off their escape...a rescue party including soldiers from Senny Bridge, men of the R.A.F., and thirty miners set to work to divert the stream above the point where it goes underground...they were brought out into the open air after being trapped for fifty-nine hours..."[6]
In 2021 the cave was the site of the next longest cave rescue undertaken in the UK, after George Linnane, a 38-year-old experienced caver, fell 8 m (26 ft)[7] and sustained multiple injuries on 6 November, 500 m (1,600 ft) from the lower Cwm Dŵr entrance. Almost 250 people were involved in the rescue, which was organised by the South and Mid Wales Cave Rescue Team and involved manually hauling the casualty by stretcher, using relay teams of rescuers, to the top entrance. Linnane was rescued on the evening of 8 November, after 57 hours; the previous longest rescue was 41 hours.[8][9][10][11][12]
The cave system
With a depth of 274 m (900 ft) and a length of at least 50 kilometres (31 mi), it is the deepest cave in the UK and the second-longest in Wales. The passages and chambers of Ogof Ffynnon Ddu weave a tortuous path beneath the east side of the Tawe Valley. The stream passage cuts through black limestone producing waterfalls, rapids, deep potholes and scalloped walls.[4] The system is divided into three parts: the lowermost (western) section is referred to as Ogof Ffynnon Ddu I (or simply OFD I), the central section as Ogof Ffynnon Ddu II (or OFD II) and the uppermost (eastern) section as Ogof Ffynnon Ddu III (or OFD III).[13]
A variety of specialised wildlife has developed underground including cave shrimps and the pale blanched trout endemic to pure underground fresh water courses with sufficient plankton.[14] Deep cracks in the vast expanse of stony moorland above provide habitats for plant life, including the lily of the valley and wood anemone, and mossy saxifrage (Saxifraga hypnoides) grows on the limestone outcrops.[5]
National Nature Reserve (NNR)
The name Ogof Ffynnon Ddu has also been applied to an extensive tract of moorland, rocks and cave systems of which the eponymous cave is a part. It was designated as an NNR because of its unique geology, floristic diversity, its industrial past and its subterranean animal and plant life.[15]
References
^"Ogof Ffynnon Ddu - Surveys". South Wales Caving Club. Retrieved 21 September 2015.
^"Ogof Ffynnon Ddu 1". Cambrian Cave Registry. Cambrian Caving Council. Retrieved 4 November 2019.
^Cave discovery anniversary marked BBC Wales - 16 September 2007
^ ab"Ogof Ffynnon Ddu 1". Caves of South Wales. Retrieved 28 April 2016.
^ ab"Ogof Ffynnon Ddu National Nature Reserve". First Nature. Retrieved 28 April 2016.
^Casteret, Norbert (1954). The Darkness Under the Earth. pp. 109–110.
^"Survey data in Survex 3D format for the site of the incident". Retrieved 10 November 2021.
^"Brecon Beacons: Rescuers reach caver stuck in Ogof Ffynnon Ddu since Saturday". 8 November 2021. Retrieved 8 November 2021 – via www.bbc.co.uk.
^"Huge mission to rescue man trapped in Brecon Beacons cave for two days". the Guardian. 8 November 2021. Retrieved 8 November 2021.
^Davies, Gareth (8 November 2021). "Cave rescue mission as man falls 50ft leaving him trapped underground in Wales for three days". Retrieved 8 November 2021 – via www.telegraph.co.uk.
^"Brecon Beacons: Man rescued from cave after two days". 8 November 2021. Retrieved 8 November 2021 – via www.bbc.co.uk.
^Humphries, Will (9 November 2021). "Wales cave rescue: injured caver joked during 57-hour ordeal". www.thetimes.co.uk. Retrieved 9 November 2021.
^Ogof Ffynnon Ddu, Penwyllt, Brecknockshire, cave survey published by South Wales Caving Club, 2014
^Ford, Trevor D. (2011). Limestones and Caves of Wales. Cambridge University Press. p. 59. ISBN978-0-521-16913-4.
^"Ogof Ffynnon Ddu National Nature Reserve, near Ystradgynlais". Natural Resources Wales. Retrieved 3 September 2020.
External links
Wikimedia Commons has media related to Ogof Ffynnon Ddu National Nature Reserve.
Virtual tour of the cave
South Wales Caving Club
January 07, 2023
ogof, ffynnon, welsh, cave, black, spring, also, known, informally, cave, under, hillside, area, surrounding, penwyllt, upper, swansea, valley, south, wales, second, longest, cave, wales, deepest, united, kingdom, locationupper, swansea, valleycoordinates51, 8. Ogof Ffynnon Ddu Welsh for cave of the black spring also known informally as OFD is a cave under a hillside in the area surrounding Penwyllt in the Upper Swansea Valley in South Wales It is the second longest cave in Wales and the deepest in the United Kingdom Ogof Ffynnon DduLocationUpper Swansea ValleyCoordinates51 49 27 N 3 39 40 W 51 8243 N 3 6611 W 51 8243 3 6611 Coordinates 51 49 27 N 3 39 40 W 51 8243 N 3 6611 W 51 8243 3 6611Depth274 5 metres 901 ft 1 Length59 kilometres 37 mi 2 DiscoverySouth Wales Caving Club 1946GeologyLimestoneEntrances3AccessSouth Wales Caving Club see website for detailsTranslationcave of the black spring Welsh Cave surveySurveyPart of the interior with a terraced cascade and three standing and climbing cave explorers wearing safety equipment Contents 1 History 2 The cave system 3 National Nature Reserve NNR 4 References 5 External linksHistory EditOFD was discovered in 1946 through digging by Peter Harvey and Ian Nixon members of the newly formed South Wales Caving Club 3 Exploration beyond the Boulder Chamber in 1957 revealed passages as far as the Dip Sump Major extensions were discovered in 1967 through to Cwm Dŵr which is now known as OFD2 The system is famous for its intricate maze like structure and its impressive main stream passage 4 It is now part of the Ogof Ffynnon Ddu National Nature Reserve which includes the ruined remains of a former brickworks including several kilns quarry workings and tramroad tracks The terrace of workers cottages is now occupied by the South Wales Caving Club 5 The cave has seen many minor incidents resulting from people getting lost or tired or surprised by flooding and various accidents such as falls which are handled by volunteer cave rescue teams who are alerted by the police More prolonged rescues have included In 1951 before cave rescue was well established two well known members of the South Wales Caving Club Lewis Railton and W H Little made their way into the huge cave that bears the Welsh name of Ogof Y Ffynnon Ddu Cave of the Black Well or Stream in South Wales when swirling water cut off their escape a rescue party including soldiers from Senny Bridge men of the R A F and thirty miners set to work to divert the stream above the point where it goes underground they were brought out into the open air after being trapped for fifty nine hours 6 In 2021 the cave was the site of the next longest cave rescue undertaken in the UK after George Linnane a 38 year old experienced caver fell 8 m 26 ft 7 and sustained multiple injuries on 6 November 500 m 1 600 ft from the lower Cwm Dŵr entrance Almost 250 people were involved in the rescue which was organised by the South and Mid Wales Cave Rescue Team and involved manually hauling the casualty by stretcher using relay teams of rescuers to the top entrance Linnane was rescued on the evening of 8 November after 57 hours the previous longest rescue was 41 hours 8 9 10 11 12 The cave system EditWith a depth of 274 m 900 ft and a length of at least 50 kilometres 31 mi it is the deepest cave in the UK and the second longest in Wales The passages and chambers of Ogof Ffynnon Ddu weave a tortuous path beneath the east side of the Tawe Valley The stream passage cuts through black limestone producing waterfalls rapids deep potholes and scalloped walls 4 The system is divided into three parts the lowermost western section is referred to as Ogof Ffynnon Ddu I or simply OFD I the central section as Ogof Ffynnon Ddu II or OFD II and the uppermost eastern section as Ogof Ffynnon Ddu III or OFD III 13 A variety of specialised wildlife has developed underground including cave shrimps and the pale blanched trout endemic to pure underground fresh water courses with sufficient plankton 14 Deep cracks in the vast expanse of stony moorland above provide habitats for plant life including the lily of the valley and wood anemone and mossy saxifrage Saxifraga hypnoides grows on the limestone outcrops 5 National Nature Reserve NNR EditThe name Ogof Ffynnon Ddu has also been applied to an extensive tract of moorland rocks and cave systems of which the eponymous cave is a part It was designated as an NNR because of its unique geology floristic diversity its industrial past and its subterranean animal and plant life 15 References Edit Ogof Ffynnon Ddu Surveys South Wales Caving Club Retrieved 21 September 2015 Ogof Ffynnon Ddu 1 Cambrian Cave Registry Cambrian Caving Council Retrieved 4 November 2019 Cave discovery anniversary marked BBC Wales 16 September 2007 a b Ogof Ffynnon Ddu 1 Caves of South Wales Retrieved 28 April 2016 a b Ogof Ffynnon Ddu National Nature Reserve First Nature Retrieved 28 April 2016 Casteret Norbert 1954 The Darkness Under the Earth pp 109 110 Survey data in Survex 3D format for the site of the incident Retrieved 10 November 2021 Brecon Beacons Rescuers reach caver stuck in Ogof Ffynnon Ddu since Saturday 8 November 2021 Retrieved 8 November 2021 via www bbc co uk Huge mission to rescue man trapped in Brecon Beacons cave for two days the Guardian 8 November 2021 Retrieved 8 November 2021 Davies Gareth 8 November 2021 Cave rescue mission as man falls 50ft leaving him trapped underground in Wales for three days Retrieved 8 November 2021 via www telegraph co uk Brecon Beacons Man rescued from cave after two days 8 November 2021 Retrieved 8 November 2021 via www bbc co uk Humphries Will 9 November 2021 Wales cave rescue injured caver joked during 57 hour ordeal www thetimes co uk Retrieved 9 November 2021 Ogof Ffynnon Ddu Penwyllt Brecknockshire cave survey published by South Wales Caving Club 2014 Ford Trevor D 2011 Limestones and Caves of Wales Cambridge University Press p 59 ISBN 978 0 521 16913 4 Ogof Ffynnon Ddu National Nature Reserve near Ystradgynlais Natural Resources Wales Retrieved 3 September 2020 External links Edit Wikimedia Commons has media related to Ogof Ffynnon Ddu National Nature Reserve Virtual tour of the cave South Wales Caving Club Retrieved from https en wikipedia org w index php title Ogof Ffynnon Ddu amp oldid 1081707839, wikipedia, wiki, book, books, library,
