1072: Bocarón, Cueva del (Famous Five Cave) (Cueva del Boquerón)
Navajeda 30T 444898 4801001 (Datum: ETRS89. Accuracy code: M) Altitude 73m
Length 309m
Area position

Updated 10th October 2005; 19th May 2006; 15th June 2006; 3rd October 2008; 4th December 2015; 29th April 2016

   The GPS reading appears to be wrong.
From the field to the south east of the village, a small stream is followed to a cliff face where the resurgence is seen. The stream is called Borja or Bocarón, although the Cantabrian map has the stream course labelled as the Arroyo Bucarrón!

   A 3 x 4m high entrance leads to a ramp up to the passage floor. Twenty metres inside, a couple of short stoops leads to 2 x 2m passage. After 70m of walking in shallow pools and clambering over the odd boulder, a 5m crawl pops out into a large chamber. On the right is a 40° slope that leads to a daylight shaft, the top entrance. The stream emerges from the opposite side of this chamber and is walked along for 20m, through some deeper pools. Cross rifts are encountered before the passage widens and lowers to a bedding. The stream takes the left wall whilst the right hand side contains numerous formations.
   A sharp right turn at the apparent end of the cave leads to a stal blockage which is passable on the right. This short squeeze leads to a deep pool which, after 50m, approaches the sump, which may be possible to lower.
   The sump is 8m long to airspace. Directly ahead is a boulder-choked rift but the deeply ponded passage may continue under water. Bad visibility has hindered progress.    The site was redived at Easter 2006, and the rift was examined but requires a hammer.
   Boulders were also removed from the left of where the stream appears in the main passageway and dived feet-first for about 20-25m but this joined the route near Kit-Up Corner. Heavier flow conditions are required to follow the main water flow.
   A dive in 2008 ended at an under water dig that became too small.

Reference: anon., 1995c (logbook); Corrin Juan, 1995a; anon., 2005b (Easter & summer logbook); anon., 2006b (Easter logbook); anon., 2008e (summer logbook)
Entrance pictures : yes
Underground picture(s):
Detailed Survey : 1:1000
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.)