Around 1959, Mr. Martí Cassany, of Vic, learned that during the war (1936-39) a group of people had taken refuge in some caves beneath a cliff in the Sau area. He was able to speak with one of them and, besides giving him the location, he explained that the ground was full of the “olles d'en Serrallonga”. Between 1959 and 1960, with the participation of collaborating members of the Museu Episcopal de Vic, the first archaeological campaign of this group of cavities was carried out.

It should be said that remains ranging from the Neolithic to the Middle Ages have been found inside.

It was not until the middle of 1973 that, through a friend from the Unió Excursionista de Vic, members of the GEP of the AE Pedraforca (Barcelona) learned of the cavity, proceeding to its complete exploration and study, which was published in the journal Speleon in 1974. It was from then on that it became known in the speleological bibliography.