Riaño 30T 451651 4800485 (Datum: ETRS89. Accuracy code: G) Altitude 132m
Length 5m Depth 5m
Updated 16th April 2008; 4th, 5th November 2009; 26th September 2012
Just up the valley from the tower is a scar with an entrance down the back of a slipped block. A 2m climb down has a dig into a small chamber where the way on need enlarging. This was found to be draughting out in 2009 and it may repay a larger dig which will be relatively easy as the floor is compacted silt. Two other digs were found to be draughting out strongly but will be harder to do, with not a lot of space to stack debris.
After some digging in a draught in 2012 the logbook states, "It needs a big dig to remove enough of the silt and sand to see where it is coming from".
Reference: anon., 2002b (summer logbook); Corrin Juan, 2003b; anon., 2008c (Easter logbook); anon., 2009c (summer logbook); anon., 2012d (summer logbook)
Entrance picture: yes
On area survey: