How to find it
Drive southwards along the D590 from Aven Marzal, looking out for a small track on the left, marked Privé and having a chain across it. Directly opposite, take the small track through the trees (slightly overgrown in places) to arrive at the entrance, a modestly-sized shaft in the ground, shortly afterwards.
Also see Aven Centura which is nearby.
The pothole is well-known for carbon dioxide; reports indicate that this has been encountered even partway down the entrance shaft.