How to find it
From Aven de la Vigne Close description at point marked (*), continue along main track. Take the left at the next fork (easy to miss on the return). After about 100m there is a small path on the right marked with a red spot. Follow the path, which is marked with cairns and red spots, to eventually lead to the cave, a fairly large hole with impressive rattle concealed in the trees.
Pitch is apparently about 15m to a boulder slope which can be climbed.