On the boulder of Incassable, near the bottom of the slope, above La Route d'Arbonne à Achères. Sitstart with a pocket left hand 2m to the left of the angle, traverse with a flat hold, pass the arete, continue to traverse with low holds in the corridor up to the sitstart of Intouchable prolongé, take crimps on the back boulder and exit by a mantle on that one, on the other side of the tunnel.
From the parking lot of the equestrian centre, follow La Route d'Arbonne à Achères for 250m; the boulder is 30m above, shortly after a TMF mark on a tree.
