The first speleological exploration took place in 1952, when the Ebo chasms were discovered by speleologists belonging to Secció d'Espeleologia del CE d'Alcoi.

The earliest available topographical sketch was drawn by Álvaro Seguí, in 1963. Years later, on March 27th, 1994, R. Pla drew the current topography. It is a chasm located in a break or fracture arranged from north-northwest to south-southwest, an extension of one of those that form the Estret chasm, closely related by this tectonic break. The entrance curb measures about 0.70 metres and is very irregular, but easy to enter. Its absolute vertical reaches 10 metres, and forms a corridor of up to one and a half metres wide by 5 metres long. In the south-west end, the ceiling reaches almost to the ground forming narrow steps that lead to two small rooms. The general morphology of the chasm is phreatic, which is seen even in the three domes formed by hydrostatic pressure. In this aspect, it is completely different from the other three large caves, in which phreatic forms are nowhere to be seen. The ground is covered by rubble and allochthons in general. The internal meteorological data, taken on March 27th, 1994, were a temperature of 17°C and 95% humidity.

The necessary material is a 10-metre rope with two spits placed at the head.(1)

(1) Information taken from the website of the Town Hall of La Vall d'Ebo.