Ogof y Daren Cilau

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Ogof y Daren Cilau
Daren entrance.jpg
Caver crawling into entrance
Location Llangattock escarpment
OS grid SO20521530
Depth 192 m (630 ft)
Length 27 km (16.8 mi)
Entrances 2
Difficulty tortuous entrance series
Access free
Translation Rock of refuge (Welsh)
Cave survey zoomable plan drawing

Ogof y Daren Cilau is one of several cave systems in the Llangattock escarpment near Crickhowell in south Powys, Wales.

Its awkward 517 m entrance crawl is a natural barrier to any casual visitor and precludes the need for a locked gate to protect it from vandals.

Highlights of Daren Cilau include the Time Machine, the largest cave passage in Britain; the White Company, a set of pure white stalactites; and the Bonsai Tree, a branching helictite.

Due to the extent of the passages several kilometres from the entrance which would require trips of up to 20 hours to explore, two permanent underground camps have been established: the Hard Rock Cafe, and the Restaurant at the End of the Universe.

The major breakthrough into the system beyond the entrance series occurred in 1984, before which the cave consisted of little more than the entrance series and several uninspiring passages.[citation needed]

In 1986 Martyn Farr connected the Terminal Sump to Elm Hole in the next valley by cave diving.[1]

After decades of work and numerous cave digging projects, a connection to the nearby cave Ogof Agen Allwedd is yet to be found.


  1. ^ "Ogof Daren Cilau". Daren Cilau. 

External links[edit]

Coordinates: 51°49′50″N 3°09′17″W / 51.83064°N 3.15479°W / 51.83064; -3.15479