1800: Fridge Door Cave
Riaño 30T 451162 4800782 (Datum: ETRS89. Accuracy code: G) Altitude 118m
Length 265m Depth 17m
Area position

Updated 27th April 2012; 23rd November 2013; 23rd May, 2nd December 2014; 30th April, 19th October, 5th November 2016; 30th September 2017; 24th September 2018

   An excavated shaft top (enlarged in July 2018), just up from the track, is covered with a fridge door. The ladder is best rigged from the tree as this puts the ladder in the middle of the entrance. A previous GPS reading is VP5126(0)0098(8) Altitude 130m. The current position is the result of a surface survey.

A 6m shaft descends to a pool. The site was explored during very dry weather in October 2013. On this occasion the cave was found to drop into a stream passage with a small flow of water generally 3-4m in diameter, leading after 130m to an upstream sump. The water level was lowered by 5cm in October 2014. A climb at the sump leads to tubes. The main passage contains deep mud, and is largely sumped in wetter conditions.
    Some draughting passages around the base of the pitch may warrant a further visit, one was connected to a climb from the streamway.
   The downstream end (near the entrance), should be the feeder to Cueva Espada.
   A dead goat prevented entry in April 2014. The body disintegrated, spilling out maggots and entrails when an attempt was made to remove it. It had disappeared 6 months later.
  At Easter 2016, when water levels were high, the site was investigated by Jim Lister (video):
- downstream - taking a lot of water, blocked by boulders.
- upstream - left hand side pool is blank after 2m.
- upstream - under the way in, dived for 7m (duck leading to dry passage in summer). The diver turned around as believed Bunnies and Beer passage sumped to the roof.

   Intensive diving work took place over July and August 2016. The upstream sump was dived and surveyed by Jim Lister past a couple of airbells to a chamber where an inlet trickles in and a possible route required capping. Colin Hayward subsequently inspected an underwater arch on the right near the end of the sump. At the moment this is too low over a large silt bank. The upstream passage seems to be heading away from Cueva Llanío and under the ridge. However, water may be coming in from Cueva Llanío or further afield, eg site 3451.
   On the single trip in August 2017, Jim Lister capped out the "possible route" constriction beyond the sump and continued upstream for 31m where another sump was met (sketch survey).
   Despite 2018 having a dry summer, the route upstream from the base of the ladder remained completely flooded, thwarting dives at the "usual" sump. (It may be possible to lower the downstream streambed by digging at the back end (upstream) in Cueva Espada.

Reference: anon., 2002b (summer logbook); Corrin Juan, 2003b; anon., 2012b (Easter logbook); anon., 2013e (autumn logbook); anon., 2014b (Easter logbook); anon., 2014d (autumn logbook); anon., 2016b (Easter logbook); anon., 2016c (summer logbook); anon., 2017c (summer logbook); anon., 2018c (summer logbook)
Entrance picture: yes
Underground picture(s): 2016 : 2017
Video: investigating pools, Easter 2016 : sheep disposal (YouTube) : sump diving videos summer 2016 (YouTube)
Detailed survey: sketch from logbook (2002) : survey (2013) : survey (2016) : additional sketch after summer 2017
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.)
with Espada (Amended magnetic declination December 2013 to align with Eur79 grid and coordinates altered to fit ETRS89 datum, April 2014.)

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