NW flank of Combin de Grafeneire "Couloir du Gardien"

Climbers in the NW flank of Combin de Grafeneire, called "Couloir du Gardien". At the end the route turns to the right through the serac zones. The last section before the serac zone, where the three upper climbers are situated, the steepness is 50° and can get rather icy.