 The 1970 Pas de la Casa avalanche was a powder-snow avalanche that happened after a severe snowstorm left of new snow atop the existing snow pack on the mountain slopes above Pas de la Casa.The avalanche began at an elevation of on the upper slopes of the Pic d'Envalira (), accelerated down the 35° slope and spilled over six bends of the old CG-2 road that winds its way down the mountain to the village of Pas de la Casa, which is at .It then hit the village, damaging several buildings including a dispensary and killing a nurse.