Cavity known in the area since time immemorial; the first partial exploration of which we have news was carried out on 30 June 1917 by some youths of the Agrupació Excursionista de Reus, among whom were Salvador Vilaseca Anguera as well as Joan Ferraté Gili and Francesc Cassador, the latter the owner of the land where the cavity is located and known in Pradell by the nickname 'Rabassó'.

Joan Ferraté together with members of the AE de Reus returned again on 8 July 1917, who explored and surveyed the entire cavity, assigning it a somewhat exaggerated depth of -60 metres, at the same time renaming it Avenc de la Pòpia.

In the summer of 1926 Salvador Vilaseca returned again to carry out archaeological excavations, with positive results, since the visit carried out in 1917 had been negative in this regard.

In November 1951 it was visited by the GES del CMB, who cite it under the name Avenc del Jardí del Rabassó. It happens that the estate next to where the cavity is located is known by the name 'Jardí del Maco'....