Asgard, North Tower, West Face Attempt. On July 7, Swiss Jean-Michel Zweiacker, Denis Burdet, Cédric Choffat and Pierre Robert began an attempt on the west face of Asgard. They tried a line between “Valkyrie” and “Hyperborea.” They climbed ten pitches about halfway up the face in miserable weather before quitting on August 5. They climbed mostly on aid and left most of their fixed ropes.