Updated 11th February 2016; 24th September 2018
The information has been roughly translated from the French, Simonnot G, 2018. The grid reference
and altitude are taken from the MCP map.
Fifty meters from the road from Santander to Arredondo (km 23.5), at the edge of the road that goes up to Garmalloso and Colorado.
The unobstructed entrance gives access at -3m to the top of a 13 m blocked pitch. A crossing above the pitch makes it possible to reach a start of meander which is quickly impenetrable.
It should be noted that there is a clear draft current at the entrance during the summer period. In winter the sense is reversed and the cavity blows strongly. In 2018, a hard day of disobstruction allows the crossing of the beginning of the meander and access to a rou3277te on a few metres finding a new passage to enlarge.
This meander has been opened up to a p10 with a rift at the base that becomes too tight.
(The grid reference in Simonnot G, 2016 and Simonnot G, 2018 puts the entrance below the main road).
Reference: Degouve de Nuncques Patrick et Simonnot Guy, 1989; Simonnot G, 2016; Simonnot G, 2018
Entrance pictures: 2018
On area survey: