The boring proceeded without any very great difficulty, but the ice was so hard that the progress was but slow. At the end of the second day Mac-Nab had nearly reached the layer of earth and sand, and could not hope to get to the top of the house before the end of the next day. Night fell, but the work was continued by the light of torches. A “snow-house” was hastily dug out in one of the hummocks on the shore as a temporary shelter for the women and the little boy. The wind had veered to the south-west, and a cold rain began to fall, accompanied with occasional squalls; but neither the Lieutenant nor his men dreamt of leaving off work. Now began the worst part of the task. It was really impossible to bore in the shifting masses of sand and earth, and it became necessary to prop up the sides of the shaft with wood, the loose earth being drawn to the surface in a bucket hung on a rope. Of course under the circumstances the work could not proceed rapidly, falls might occur at any moment, and the miners were in danger of being buried in their turn. Mac-Nab was generally the one to remain at the bottom of the narrow shaft, directing the excavation, and frequently sounding with a long pick, but as it met with no resistance, it was evident that it did not reach the roof of the house. When the morning once more dawned, only ten feet had been excavated in the mass of earth and sand, so that twenty remained to be bored through before the roof of the house could be reached, that is to say, if it had not given way, and still occupied the position it did before the fall of the avalanche. It was now fifty-four hours since Mrs Barnett and her companions were buried! Mac-Nab and the Lieutenant often wondered if they on their side had made any effort to open a communication with the outer air. They felt sure that with her usual courage, Mrs Barnett would have tried to find some way out if her movements were free. Some tools had been left in the house, and Kellet, one of the carpenter’s men, remembered leaving his pickaxe in the kitchen. The prisoners might have broken open one of the doors and begun to pierce a gallery across the layer of earth. But such a gallery could only be driven in a horizontal direction, and would be a much longer business than the sinking of a shaft from above, for the masses flung down by the avalanche, although only sixty feet deep, covered a space more than five hundred feet in diameter. Of course the prisoners could not be aware of this fact, and if they should succeed in boring their horizontal gallery, it would be eight days at least before they could cut through the last layer of ice, and by that time they would be totally deprived of air, if not of food. Nevertheless the Lieutenant carefully went over every portion of the accumulation himself, and listened intently for any sounds of subterranean digging, but he heard nothing.