Thanks to a forgotten map we missed our way and ended up on the inside of Vallaccia. We decided to climb to Forcella Vallaccia, then saw the scree couloir which leads up there. Took a "clever" side gully which ended up 5m above the steep scree. Climbed down in insane circumstances to finalize the scramble to the forcella. Decided to reward ourselves with the climb to Sas de la Undesc. Near perfect views all around.