2417: Letterbox Cave
Riaño 30T 451818 4800249 (Datum: ETRS89. Accuracy code: G) Altitude 160m
Length 37m Depth 7m
Area position

Updated 25th April, 7th May 2013

A strongly draughting, letterbox entrance just beyond the entrance to Mad Axe Woman Cave. A 3m flat-out crawl leads to a 3 x 3m stand-up chamber. A drop down a square slot enters a 1m wide passage going 10m to a choke. A climb up to a bedding leads to tree roots and a choke. On the left is a blocked tube while below the slot is a small draughting passage which may dig.
The site was surveyed at Easter 2013.

Reference: anon., 2006b (Easter logbook); anon., 2013b (Easter logbook)
Entrance pictures : yes
Underground picture(s): yes : photos of spiders, 2013
Video : likely to appear after summer 2013
Detailed Survey : pdf file
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.)