Tresviso Caves Project

Tresviso Caves Project Gazetter


East, North:357488, 4792375 (nearby)
Coordinate Quality:GPS
Long, Lat:-4.7561459962944, 43.270685886449 (map)
Elevation (m):1194
Length (m):73
Depth (m):-21
Active Lead:
Survey Available:


The PO-39 cavity is just next to Fernando and Manolo's cabin, and a few meters above the PO-38.


No description currently available


The cavity has two mouths, one upper and capped by blocks, and the lower one about 40 cm wide. Already inside, the cavity remains narrow, without offering comfortable dimensions. To our right, and after a narrow step, we will stand on a small ledge. From this repairs, and after descending a small vertical of 4 m, we will access a room already larger. In this room we can see in its ceiling the upper entrance capped by cudols. After overcoming a rising bump in a wall of sediment that collapses in each step, we reach a narrow fracture where we will hear the sound of an active course. The fracture of about 5 m of travel, and with a width that in no case exceeds 40 cm in width, ends at a small well from where we observe a small waterfall coming from an upper gallery, and below d 'she the active course. After lowering this well, and following the active course downstream, we will reach a point where the duct greatly reduces its size. The water, following its course, ends up penetrating through a narrow, partially flooded passage, which suggests a possible continuation. Just on the side where the water is added, a small duct can be walked ten meters until it is completely closed. Returning to the 5 m waterfall, and using an upward handrail, we will be able to access the upper gallery where the asset arrives. This gallery has much more comfortable dimensions. A few meters away, we will find ourselves in a spacious room. In this room, and from its ceiling comes a water supply. This contribution is directly related to a watercourse that we find on the outside, which is added by an impenetrable sink at the bottom of a dolina, which is above the cavity. Surpassing the room, and continuing through the cavity, a new contribution appears from the ground. The cavity is always ascending, and very close to the surface, as evidenced by the large number of roots we find in the roof of it. Finally a low, and very chaotic, stay marks the end point of the PO-39. The PO-39 gives us results of 21 m difference in elevation (11 m negative with respect to the entrance, and 10 m positive with respect to the same) and a total development of 73 m. Exploration in progress.


Club d'Espeleologia l'Avern,2018


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