Cave entrance up on shoulder in Craig Y Nos Quarry.
The cave is situated in an old quarry on the West side of the Swansea to Sennybridge road, just before Craig-y-Nos Castle. The entrance is about one third of the way up the quarry on a shoulder dividing two of the quarry faces.
A squeeze on the left of the entrance passage leads to the main system which consists of large passages filled with clay and boulders.
Found in 1939 and re-visited by SWCC in 1949
Cullingford, C.H.D. (1951) Exploring Caves,pp.73
British Caver, 25, 1954, p.27
Caves of South Wales, 1995, p.95
Caves in Wales and the Marches (Dalesman), Jenkins, D.W. & Williams, A.M., 1st Ed.1963, p.26