The spring has a length of 51 metres. The dive begins at the pool, a ramp that quickly gains depth until reaching the cave entrance. In this stretch the bottom is full of large boulders, the guide line marks a distance of 15 metres, and the depth gauge indicates -6 m. The entrance has a spectacular size that narrows until reaching a stone that forms a kind of joint. Immediately afterwards they enter a bedding plane, which has an approximate height of 35 cm, and a width of several metres depending on the stretch. They manage to pass the bedding plane until reaching a collapse, where one can see that the water current comes from the other side but it is not possible to pass. At this point the length is 40 metres, with a depth of -10 m. On the way out another part of the bedding plane is checked and a small gallery of tiny dimensions and 11 metres in length is found.

The water is crystalline and nothing of percolation, nor sediments, can be seen.

The cavity is an important spring, which contributes part of the water flow of the Riu Rialb. Perhaps the water that comes out of the Font could come from a loss or filtration of the Gavarra torrent, from the area called les Cots, but it would need to be confirmed. On arriving at the Font de Bulí, they notice that the water coming out of the Font is notably warmer than that of the river. They take the dive computer and put it a few metres upstream along the Rialb river, the temperature is 9ºC, they repeat the same procedure inside the pool that forms the entrance to the Font and the measurement gives them 16º C. Once past the Forat de Bulí, and just before leaving the river to take the trail that leads to the car, they take another water temperature measurement giving them 12º C.

Carles Ramoneda and Joel Borrazàs go upstream along the Rialb river for about 100 metres to the Font de Bulí. As they do not see any guide line installation, they proceed to install it and begin the dive at the pool. They try to find the continuation and manage to pass the bedding plane until reaching a collapse. All the guide line is removed and they return descending along the Rialb river. The dive equipment used for the exploration consists of two 10 l. bottles at 200 bar in side mount.