Updated 25th September 2018; 17th November 2022

A continuing cave on at least two levels. The site was first identified in 2007 then excavated, explored and surveyed by the SC Dijon in 2007, 2008, 2010 and 2014. In August 2017, the temperature of the strong draught at the entrance was 12.8°C when the exterior temperature was 29°C.

The information below has been roughly translated from the French, Spéléo-Club Dijon reference, Simonnot G, 2016, Simonnot G, 2018 and Simonnot G, 2022..

   On the left bank of Rio Asón, 40 m above the bed of the river. The small entrance, about thirty meters from a hut, is however difficult to spot in a stand of green oaks.
   The small opening, from which emerges a powerful draft, has been enlarged and descends over 5 m (unobstructed into the earth) to intersect a more spacious duct. On the left about fifteen meters was traversed in diaclases finally impenetrable (no air).
On the right a comfortable gallery of 10 m passes the Tejonera (nest of badgers ("techons" in Burgundy)) that no longer seems inhabited since our first explorations. At the end the Bull's Eye was quite easily opened in a moonmilk flow, then a very thin diaclase could only be crossed at the level of a high bench (the Zarzaparilla). Since the first passage of light work (chisel then later striking means) have made the crossing more comfortable (... or say less painful).
The exit of the narrow is made directly to 2 m high in the wall of a large gallery.

The black fountain gallery
The change in size is spectacular because we find ourselves in a major conduit (6 to 10 m wide) which in reality probably came out in the hillside by a neighboring cave now clogged (Cueva No. 2061 (MCP: 4299). The access passages are therefore only a small diversion.
The beautiful concretized conduit is occupied by a remarkably horizontal filling, regrooved by the small temporary flow of the black fountain which sinuates in this floor before being lost definitively 50 m further.
A rise in sediment leads to a high room centered on a large diaclase. A small climb makes it possible to reach the bottleneck of Les Gros Thutes where the current of air is again very sensitive.
This is the key passage to access Gallery Z and the Emmaus well. Just before the high hall, on the left hand, a conduit continues in a small gallery of a hundred meters, which has in its first part a diversion ensuring the link with the gallery Z

Gallery Z
The mouth of the bottleneck Gros Thin is in a large gallery, the largest of the cavity despite the imposing filling that fills part of it. On the right, it immediately stops; a small water supply to the ceiling creates a concrete zone (cauliflower) where a modest opening, swept by a good draft, marks the top of the Emmaus pitch (P.34).
To the left of the gutter, the large Z gallery forms a large bend and ends quickly on a high, completely clogged daclase. Only a side window allows to continue a little. In spite of a delicate climbing the advance of this side was very modest. A racking after the turn should be reviewed.
In the middle of the gallery Z a perpendicular corridor descends to join the flank and the first landing of the Emmaüs pitch.

The pitch and the Emmaus gallery
The departure of the P.34 is a little narrow but then the descent is more comfortable. Down a straight, but narrow, roller coaster, ends after a final jump (equipped) in front of an initially impenetrable blowing crack (-34).

Diary (from Simonnot G, 2022)
2007 The entry is marked on April 15, 2007 (Pierre Perrault and Guy Simonnot). A first clearing makes it difficult to progress over 4 m. The smell of badgers is particularly captivating and it is only the strong current of blowing air that maintains the motivation!
  April 27: a small tug makes the opening a little more comfortable. An hour of work in a plug of earth and blocks, and the Tejonera is accessible. Stop in front of the Oeil de Boeuf. Development: 30 m (G. Simonnot)
  July 22: opening of the Œil de Bœuf, passage of the Zarzaparilla and exit into the great gallery of the Black Fountain. Development: 150 m. (G.Simonnot)
  August 11: The Zarzaparilla is slightly modified for the passage of reinforcements. A small corridor (goulet des Gros Minces) makes it possible to find the continuation of the large conduit and to locate the top of the Emmaüs well. Development: 310 m (Olivier Regnault, Maxime Simonnot, G. Simonnot)
2008 February 22: Climbing and equipping a ledge at the bottom of the upper network (Martin Simonnot, G. Simonnot)
  July 26: Descent from the Emmaus well and advance in the meander to the narrow blowing. Development 450 m (Patrick and Sandrine Degouve, Martin, Maxime and Guy Simonnot)
   August 12: Topography in the upper floor and climbing in one of the galleries (Patrick and Sandrine Degouve, Ludovic Guillot, Chantal Nykiel, Guy Simonnot). Development 530 m
2010 August 9: After two years, we are finally returning to unclog the blowing narrowing at the terminus (-34) At -42 we set foot on a small local collector. Its ascent allows you to travel 300 m of galleries. (P. and S. Degouve, L. Guillot, Ch. Nykiel, G. Simonnot). Development 830 m
2014 April 17, 27 and May 26: expansion work in the entrance galleries. Techon Gallery (Guy Simonnot)
   September 24: Topography of a hundred meters in the upper floor. The development is around 900 m. (Guy Simonnot)
2017, August 14: temperature of the violent air current blowing at the entrance 12.8°C (external temperature 29°C)
2020 + Magic Ulises and Guy Simonnot (NJo account above)

References: Simonnot G, 2016; anon., 2016a (January, February logbook); Simonnot G, 2018; Simonnot G, 2022
Entrance pictures :
Underground pictures :
Video :
Detailed survey :
Line Survey :
On area survey :
Survex file :