2739: Coercion Cave
Fresnedo 30T 453869 4801940 (Datum: ETRS89. Accuracy code: G) Altitude 128m
Length 315m Depth 26m
Area position

Updated 4th October 2008

The entrance lies at the lowest point of the depression, at the foot of a large, normally dry valley. A 2m climb down through tree branches leads to a steeply sloping passage with two small passages off to the right and a larger route to the left.
This latter can be followed to a choke straight ahead, and a crawl to the left through several excavated squeezes into a wider section. Flat out crawling leads past a passage on the left, which meets a tight passage running two ways at a T junction and not pushed to a conclusion, and slopes down steeply with the dip of the beds to end at a dig.
Back at the entrance the left hand small passage can be followed through a tight uphill squeeze, with a slippery mud floor, to pop out in a much larger passage. To the right ends quickly, whilst to the left is a phreatic tube which drops gently nearly on the strike. Hands and knees crawling gives way to walking, as a number of over-tight or choked inlets join down the steeply dipping beds from the right. There are also a number of steeply sloping outlet passages dropping on down the bedding under the left wall and these unite in a small sump. At a sudden change in passage direction the way on becomes a steep ramp down the dip before meeting a fault. A 5m climb in the roof here leads to about 20m of passage heading in a south westerly direction, with a possible continuation in the opposite direction but which needs protection to gain entry.
Only a few metres beyond the fault a junction is met. To the right meets a narrow rift passage at a T junction, with the way on to the left blocked by a dangerous swinging slab and the right extension remaining unpushed.
To the left in the main passage continues, to end currently where it splits into two small routes with the draught coming from the left hand one.
In the summer of 2008 the swinging slab was passed and protrusions knocked off the walls to make the tight route passable. This leads to bigger walking passage and chambers. The route ends with fine walking passage and a sump.

Link to entry in the Cave Diving Sump Index.

Reference: anon., 2007d (summer logbook); Corrin Juan, 2007a; anon., 2008e (summer logbook)
Entrance pictures : yes
Underground pictures : yes
Video :
Detailed Survey : 1:500 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.)