A cavity known for many years to hikers, although it does not appear cited in the old catalogues. The first reference we find is in the Guia de Sant Llorenç del Munt (CE Terrassa, 1935) where they speak of a single fissure of little importance. These data are repeated in later citations. The GES - CMB visited them for the first time in September 1950 and on many other occasions throughout the 1950s and 1960s. The only survey known of the whole group was possibly made around 1961 or 1962 and in it the whole group of the four small cavities already appears. There is a later survey (Mansell-Badiella 1984) but only the first cave is shown in it.