Through a wide entrance one enters the main gallery, whose floor in the first metres is covered by sediments; after a few metres the gallery narrows and begins to climb among the blocks. The sections are very varied, from narrow and high to rounded and lower-ceilinged. About 80 metres from its start the gallery opens out into a chamber 13x8 and 4 metres in average height; this chamber initially descends slightly and then climbs steeply up to the end point of the gallery (level +17m).

About 40 metres from the entrance, on the left, we find a narrow passage that gives access to some upper galleries; after the first metres we reach the foot of a muddy ascending ramp; once the ramp is climbed, at the top we find a passage of about twenty metres that heads in the direction of the Segre river, but which ends up becoming impenetrable.

Back at the base of the muddy ramp we find in its very middle an opening that gives access to a crawlway that soon becomes wider; after passing a large block in the middle of the gallery, the ceiling forms a shaft that rises about 4 metres; from its upper part a gallery of 11 metres emerges which later connects with the gallery we are following. We continue along the lower gallery until we reach a small chamber where, on the right, the upper gallery described above reaches us. Through a narrow passage of little more than one metre we reach a wide descending gallery about 3 metres wide and almost 5 metres high.

Back in the main gallery, 70 metres from the entrance and about 10 metres before reaching the final chamber, on the left we find a narrow passage that soon gains width; the gallery climbs rapidly until it emerges into the wide gallery described above, which we reached through the other passage and just below it, in the lower part of the wide gallery. The gallery continues climbing gently, with some formations found at this point; finally one reaches a chamber where, at its far end and on the left, we find a passage behind the rock that crosses it from side to side; this is the highest point of the cavity (level +28m); in the very middle of this passage the mouth of a shaft opens. To descend the shaft we will need a 30 metre rope rigged on an existing rock bridge beside the shaft and a spit at the head of the shaft. It is a muddy shaft; it begins with a slight ramp of 3.4 metres followed by a vertical drop of 6.10 metres where we land on a small ledge; the shaft continues with a steep ramp of 6.50 metres; at this point the shaft turns and continues descending in a steep ramp for 11 more metres to the base of a gallery; in total it is 21.5 metres of vertical drop. If we head NW we will enter a chamber of about 15x12 metres and 2.80 metres in height, with an important accumulation of sediments in the middle; surrounding the entire wall of the chamber we find a channel in the form of a free meander without sediments about 80 cm high. If on the contrary we head SE, we will easily descend a 3.50 metre step that will place us in a sump located at level +1.50 metres relative to the entrance. The sump is 2x0.72 metres and approximately 3 metres deep, where a passage can be seen continuing.

The gallery continues climbing gently, with some formations found at this point.

When the reservoir is at a high level, the cave remains submerged under water. The maximum impoundment level of the Oliana reservoir is 518 metres, which means that access is only possible when the reservoir level is below the 505 metre level.

The sump is 2x0.72 metres and approximately 3 metres deep, where a passage can be seen continuing.

After Coll de Nargó, along the C-14 (heading towards la Seu d'Urgell) we find on the right the well-known pont d'Espia, where the L-401 road begins, setting out on the long route to Sant Llorenç de Morunys and Port del Comte. Once past the bridge we find on the right a good place to park and only about 250 metres past the bridge we find a traffic information sign; at this point one must descend about 13 metres down the slope until reaching a small path that lies before the cliff and which we follow in the direction of the Pont d'Espia; after about 30 metres we reach a pine tree which we will use to rig a 40 metre rope that will allow us to descend to the river; the descent begins with a steep slope that soon leads us to an overhanging vertical drop of about 15 metres (a rope protector must be carried); one lands on a rock that keeps us out of the water; the cave is about 6 metres downstream and to reach it one must wade in up to the crotch because of the accumulated sediments in which we sink into the mud.

There is another access a little further on that allows one to descend to the river without equipment; then, to reach the cave one must go upstream against the current, where getting completely wet is guaranteed.

To descend the shaft we will need a 30 metre rope rigged on an existing rock bridge beside the shaft and a spit at the head of the shaft.

During the great drought suffered by Catalonia in the summer-autumn of 2022, three members of the ERE-CEC and of the SIE-CEA devoted 3 trips during the month of October to completing the exploration and survey of the whole cavity. In this period, the cave lies below the reservoir level, but currently the course of the Segre passes right along the left bank at the entrance. It could be observed that during a few hours of the day and apparently due to the daily closing of the gates of the small hydroelectric plants existing on the course of the Valira (Andorra), the Segre flows with less volume and exposes a large rock existing a few metres from the cave, which can be reached at this time by means of a rappel and accessed with practically no getting wet.

We also have evidence that adventure companies in the area run kayak excursions and, when the reservoir waters allow it, they stop at the cave and visit part of it.