Updated 7th October 2010; 21st, 24th September 2012; 28th January, 4th March 2013; 30th November 2016; 1st May 2018; 12th May 2019

   A draughting hole in the wood which used to have a door frame around the entrance. The passage quickly leads to a stream which becomes too wet and narrow upstream, presumably as it approaches the stream in Lenny's Cave. A good draught was also noted in the summer 2010.

   On the right in the entrance chamber, a passage on the right leads to another, excavated entrance and about 40m of "squalid small tubes", explored until the route became "too restrictive". A complete, probably modern, pot was found just inside this upper entrance.

   The entrance was surface surveyed and re-GPS'd in December 2013: a compromise position is shown above. A partial survey was also carried out at that time.

   Over Easter 2018, the Matienzo Karst Entomology Project (led by Tom Thompson) followed up a previous study by collecting bugs, spot sampling and setting pitfall traps in a number of sites under a Cantabria-wide permit. The Entomology Project carried out some work in this cave. Traps were retrieved and spot sampling was carried out over Easter 2019. Photos were also taken.

References: anon., 1981a (logbook); Corrin J, 1983c; anon., 2010c (summer logbook); anon., 2012d (summer logbook); anon., 2012f (Christmas logbook); Corrin Juan, 2013a; anon., 2013b (Easter logbook); Thomson Tom, 2016; anon., 2018b (Easter logbook); anon., 2019b (Easter logbook)
Entrance pictures : 2012, 2013, 2018 : 2019
Underground picture(s): yes
Detailed Survey : DistoX part survey : drawn up partial survey
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.)
as part of an area survey (Amended magnetic declination December 2013 to align with Eur79 grid and coordinates altered to fit ETRS89 datum, April 2014.)