Updated 3rd March 2000; 14th May 2000; 28th April 2002; 18th May 2011; 15th September 2019

A deep, 100m long twin depression, lined with 30m high cliffs at the north-east end with a shallower depression to the southwest. The northwest wall has a resurgence entering about 7m up but the passage at the top quickly becomes too small. The stream sinks in a bouldery floor which would appear relatively easy to dig. There are a number of holes in the southern part of the depression that take water; one drops 4m in a rift to a bouldery floor. Another on the southeast side has been dug down about 8m in a rift, with boulders on one side and fill in the floor.

The impressive site sits directly over the avens at the end of the 3rd River Inlet in Cueva de la Hoyuca (107). There appears to be about 50m altitude difference.

On a visit to take better photos in May 2011, a number of large trees were found to have fallen. This has allowed more light down to the bouldery floor resulting in a profusion of ferns and saplings. The depression was entered from the southwest end and a route down from the separating ridge into the deeper, overgrown northern end was not forced.

A visit in July 2019 described the dense vegetation with giant 6ft ferns and brambles the size of trees. a 30cm diameter hole in the base of a pit was discovered where a boulder rolled 2 or 3m - but it is unclear where this was.

References: anon., 1998d (logbook); Corrin Juan, 1999; anon., 2000a (February logbook); anon., 2000b (Easter logbook); anon., 2002a (Easter logbook); anon., 2011b (Easter logbook); anon., 2019d (summer logbook)
Entrance pictures: resurgence :  view to the NE 1 :  view in the shallower end : view to the NE 2 :  view to the NE 3 : May 2011
Underground picture(s):
Detailed survey:
Line survey:
On area survey:
Survex file: