In the cave with a blue number 3, 70m to the east of Contrainte. Start with a crack about 2m from the 'horizontal' entrance of the cave, climb the roof without the pedestals and exit through the 'vertical' entrance of the cave. NB: About 8m long, bring a light!
In "La Grotte des Barbizonnières" numbered 3 on the blue path, 200m after La Roche Henri Chaput from Barbizon, on the ridge above Multijeux and Lou-Lou.