3991: Lolo (del Secretario), Cueva de
Solórzano 30T 452480 4803262 (Datum: ETRS89. Accuracy code: G) Altitude 90m
Length 275m Depth 3m
Area position

Updated 26th October 2016; 24th September 2018

   A well-known cave in the area that has been explored and surveyed by the Grupo Espeleológico de Santander del C.A. Tajahierro. Their survey is published in Exploraciones en Solorzano (Santander) in Los Sótanos de la Tierra, No. 5, 1980, Santander (ref. 1980a).
  Nowadays, the entrance to this cave is through a locked grille at the Medical Centre, from where the key can be obtained. The cave floods in wet weather.
   Beyond the door there is lots of broken glass and the passage is then varied going from walking size to flat out. A side passage on the left (on the way in) has been opened up to easy going, keyhole-shaped passage trending down to a pool of water with a blind climb to a rift above. The main passage goes for about 200m to a sump.
   The sump was dived in August 2016 when Colin Hayward - in water conditions about a metre lower than normal - passed through a duck then into the sump to reach a chamber, having laid 30m of line. The chamber is roughly 5m each side with a mud bank down the middle. Around the outside, a dry water course was observed leading from a low passage in the southwest corner. A questionable boulder bridges the passage and this may need breaking up before it is safe to proceed.
   On the same day, the climb down near the entrance, previously sumped, was found to be a watery rift along the same line as the streamway with routes going off in both directions. Neither way was explored.

   In July 2018, the sump was found to be choked with gravel, probably due to heavy rains earlier in the year.

Link to entry in the Cave Diving Sump Index.

Reference: anon., 1980a; anon., 2014b (Easter logbook); anon., 2016c (summer logbook); anon., 2018c (summer logbook)
Entrance pictures : Easter 2014
Underground pictures : Easter 2014 : August 2016
Video : dive August 2016 (YouTube)
Detailed survey : from anon., 1980a : pdf April 2014 (revised grid ref 2018) : sump area sketches, August 2016
Line Survey :
On area survey :
Survex file : yes