Going along the B-122 road from Terrassa to Rellinars, past km. 8 there is a bend and a bridge that crosses the torrent de la Serra Llarga. From here a track leaves to the right that first runs parallel to the road and then climbs towards the ridge of the Serra Llarga and which must be followed until it turns towards the S and makes a couple of bends and positions itself below the Turó del Queixal. Here, to the right of the track, a path leaves that follows the ridge of the Serra del Gall. When you reach an electricity pylon you must begin to descend, as best you can, to the torrent on our left (according to the ICC: Torrent de la Font del Troncó) and reach its bed, where the pit is found a little further down from the high-voltage line.