Rhondda Cynon Taff
, Northern Outcrop - Central (Penwyllt to Penderyn)
map using leaflet map:
On common land.
A large postglacial depression, the sink of the Nant Sychbant.
Following the survey of the cave a dry entrance (this entry) was dug at the back of the shakehole.
Marked on 1840 tithe map of Penderyn. Dug by BNSS. A small breakthrough was achieved by WSG, but ended in a massive choke beneath a 20m pitch. Floods have now reblocked the lower parts again. A dig started in 2007 by Tony Donovan, Roy Fellows and Paul Quill broke into the cave near the sink in 2008.