Discovered as a "top entrance to a badger sett" the site was dug out (finding no badgers) to a series of tight rifts which "could be pushed further by someone good at thrutching". Another entrance (for badgers) is site 3646.

Reference: anon., 2012b (Easter logbook); Corrin Juan, 2013a
Entrance picture : yes
Underground pictures :
Video : yes
Detailed Survey : pdf
Line Survey :
On area survey :
Survex file : yes (Amended magnetic declination December 2013 to align with Eur79 grid and coordinates altered to fit ETRS89 datum, April 2014.)