This cave is also located on the lavas of 1792/3, the same flows that gave rise to some of the most beautiful and well-known caves on Etna, including the Grotta dei Tre livello and the Grotta Ktm. The cavity is accessed from a collapse of modest dimensions marked by surveyors by a rock man. This hypogeum is wider than it is long and extends over a large room and a more modest and lower one. There are two elements of great naturalistic interest: a beautiful roll with an undulating S shape that follows the direction of a channel that closes after a few meters. In the smaller room mentioned above, a large concave area opens up on the ceiling, a good meter wide and about 50 cm deep. It seems to be a blister, a gas bubble that caused the liquid lava flowing inside the tunnel to explode. This hypothesis seems to be confirmed by the swelling of the rock that forms the edges of the concavity. This very particular characteristic element has led to the Grotta dei Blister being considered the most suitable name.

At the time of the survey, there were no typical men or other signs of human passage, leading us to hypothesize that it could be an unpublished or very little-known cave.

In the immediate vicinity there are two other caves worth visiting, discovered by the same “explorers”: the Spiderman cave and the Grotta dei Cunicoli.