From the sanctuary’s car park, go towards the cross. Once at the viewpoint indicator, follow the path that goes down to the left. Then cross the road Route de Piétat and go straight up. Do not cross the bridge and take the left-hand track then turn right. Go straight on to the junction and turn left on the track that goes up, then once again to the left. At an old quarry follow the track in the middle. During the climb, you will see a hole that looks like an old lair.