, Northern Outcrop - West (Black Mountain)
map using leaflet map:
A large shakehole located to the right of the footpath to Llygad Llwchwr.
A tube with muddy floor descends for 15m to reach the top of a very muddy climb down boulders (handline useful) At the bottom a passage is reached with a streamway heading in two directions. Downstream is low. Upstream reaches an area of boulders and digs and an upstream sump that has been dived to reach an underwater choke.
Mike Barnes 2005
Descent 190, p.23, Heaven's Door: the terminator
Descent 200, p.20, Heaven's choke
Descent 202, p.11, Draughty heavens
Descent 205, p.13, Martyn Farr, Significant find in Heaven's Door
Descent 207, p.13, Martyn Farr, Collapse in Heaven's Door