Omega-1 del Ballaur

The pit opens among unstable blocks, with a small shaft modified by the action of weathering agents. After a three-metre drop, one lands on a debris cone in a small chamber still lit by outside light; at the bottom of this, a constriction widened in August 1977 by the GSP leads into a 23-metre pit. It begins among unstable slabs and then opens out, after a small terrace, into a bell shape. At the bottom is a chamber 10 m by 4 m, with unstable landslide boulders: opposite the arrival of the pit, a constriction has been widened (GSP, SCT, August 1977) leading into another, smaller chamber with unstable blocks. The air can be followed to a constriction that leads into an impassable fissure. An tributary passage in the small chamber was climbed for a few metres, soon becoming impassable.

The constriction at the bottom of the small chamber, with a strong draught of air, was widened in August 1977 by the GSP. In July 1983 an attempt was made to widen the terminal fissure, but without any result. In the branch of the tributary passage climbed for a few metres, no air was felt.