The cave winds along a channel and is made up of several sections. There are two easily accessible and visitable galleries, one further downstream and the other further upstream of the same lava flow channel, originating from eruptions in the mid-70s. In the part further upstream at the entrance there is a characteristic rock arch that survived the lava flow from the channel. The cavity is located a short distance from an enormous boulder of lava rock, the so-called Petra or Munti, known especially to local ski mountaineers, as it is taken as a point of reference in one of the most fascinating off-piste routes on the volcano. In the summer, however, the same place is difficult to reach due to the particularly impervious lava flows and the absence of paths on these flows from the 11s. The hypogeum, which has not been previously surveyed, is often covered by snow in winter, which is why it is not visible to the passage of many ski mountaineers, it is composed of two cavities that have ice and snow inside even at the beginning of summer creating a sort of slip inside. On the date of survey, 2021 May 26, there was about a meter of snow covering the bottom. The first cave, a classic flow channel, in which there are melting phenomena, is 50 meters long, on a steep slope. The second passable section is about 40 meters higher up. Just follow the channel and it is recognizable by the arch at the entrance previously described. This part of about 3 meters is more interesting. Despite the high temperatures outside, the bottom was almost entirely frozen inside. The cave in this section is easily passable on foot as it is on average XNUMX meters high. Here too, both melting phenomena and flow streaks are present. At the bottom of the cavity, a collapse in the vault allows access to a beam of light that makes the environment suggestive.