 A rock fall then sealed the shaft above the eighth level of the mine, trapping 40 miners there, two on the 13th and another on the 18th.The miners, now trapped and unsure when and if help would arrive, attempted to ration the remaining food from their lunches.However, the food ran out before the second day, and the only nourishment they had left was tea they made from birch bark scraped from the wooden planks lining the mine walls and heated with the miners' carbide lamps.