From the top of the Toura chair lift, you reach Brêche du Grand Creux (2804m) to the south. Go up towards Tête des Rachas and around the cornice on the east, take foot on the broad scoop which descends towards the southwest (35°). At the altitude of 2450m, traverse towards the south under the rock barriers towards the place called Pierre Grosse. Continue descending diagonally towards the left heading South, going around small rock barriers to join the ridge which leads to neck 1848, primarily following the summer route. From the neck, descend the east slope for a few meters and traverse to the left (northeast) via a ledge then to descend directly towards the southeast to the small bridge located to north of the reservoir at elevation 1639m. Depending on the snow cover you can descend on skis to Saint Christophe en Oisans where you will have arranged for a shuttle.