1618: dig
Riaño 30T 452728 4799381 (Datum: ETRS89. Accuracy code: M) Altitude 290m
Length 36m Depth 5m
Area position

Updated 21st October 2001; 18th February, 26th September 2012; 30th April 2016

   The water flows down into this depression below an abandoned barn from at least two resurgences, site 1617 and site 1666. A good stream sink against a 5m high limestone face, almost certainly feeding into Hoyuca beyond Cross-Over Crawl.
   The entrance was dug out in the summer of 2001 to enter a flat out crawl that soon enlarges to a 4m high junction in a rift passage. Straight ahead, down a couple of small climbs, leads to a tight, possible dig in the floor. In the opposite direction the passage chokes in the floor.
   In 2012, it was described as having "no obvious prospects" but, in March 2016, "a concerted digging effort would be needed, but it may be worth it".

The cave appears on the Cueva Hoyuca and the Four Valleys System Hydrology diagram.

Reference: anon., 2001a (Easter logbook); anon., 2001c (Summer logbook); Corrin Juan, 2003a; anon., 2012d (summer logbook); anon., 2016b (Easter logbook)
Entrance picture: yes
Underground picture(s): rift heading south westlooking north east with entrance up to the right : summer 2012
Detailed survey: 1:500
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.)
Hydrology (Terry Whitaker): Hoyuca and the 4 Valleys System

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