0710: Sprog on a Rock
Cobadal 30T 449760 4797758 (Datum: ETRS89. Accuracy code: G) Altitude 443m
Length 46m Depth 33m
Area position

Updated 10th October 2004; 10th January, 21st February 2017

From the obscure entrance, two 22m pitches, with many rub points, drop on a 127 degree (magnetic) fault to a choked floor. A rift on the fault that appears to go deeper was enlarged and entered in December 2016. Three pits were dropped that all choked. The site was surveyed.
The good draught felt at the tight entrance is thought to come from holes higher up.
A bolt sticks out of a rock just above the entrance. It may be that the entrance is completely covered with a cap stone, as was the case in 2016.

Reference: anon., 1988 (logbook); anon., 2004d (summer logbook); anon., 2016e (Christmas logbook)
Entrance pictures : from 2004
Underground picture(s):
Detailed Survey : 2016 pdf
Line Survey :
On area survey :
Survex file : yes