All set to work zealously, men and women alike seizing shovels and pickaxes. The masses of ice, sand, and earth, were vigorously attacked at the risk of provoking fresh downfalls; but the proceedings were ably directed by Mac-Nab. It appeared to him best to begin at the top of the accumulated masses, so as to roll down loose blocks on the side of the lagoon. The smaller pieces were easily dealt with, with pick and crowbar, but the large blocks had to be broken up. Some of great size were melted with the aid of a large fire of resinous wood, and every means was tried to destroy or get rid of the ice in the shortest possible time. But so great was the accumulation, that although all worked without pause, except when they snatched a little food, there was no sensible diminution in its amount when the sun disappeared below the horizon. It was not, however, really of quite so great a height as before, and it was determined to go on working from above through the night, and when there was no longer any danger of fresh falls Mac-Nab hoped to be able to sink a vertical shaft in the compact mass, so as to admit the outer air to the house as soon as possible. All night long the party worked at the excavation, attacking the masses with iron and heat, as the one or the other seemed more likely to be effective. The men wielded the pickaxe whilst the women kept up the fires; but all were animated by one purpose—the saving of the lives of Mrs Barnett, Madge, Kalumah, and the astronomer. When morning dawned the poor creatures had been buried for thirty hours in air necessarily very impure under so thick a cover. The progress made in the night had been so great that Mac-Nab prepared to sink his shaft, which he meant to go straight down to the top of the house; and which, according to his calculation, would not have to be more than fifty feet deep. It would be easy enough to sink this shaft through the twenty feet of ice; but great difficulty would be experienced when the earth and sand were reached, as, being very brittle, they would of course constantly fill in the shaft, and its sides would therefore have to be lined. Long pieces of wood were prepared for this purpose, and the boring proceeded. Only three men could work at it together, and the soldiers relieved each other constantly, so that the excavation seemed likely to proceed rapidly. As might be supposed the poor fellows alternated between hope and fear when some obstacle delayed them. When a sudden fall undid their work they felt discouraged, and nothing but Mac-Nab’s steady voice could have rallied them. As the men toiled in turn at their weary task the women stood watching them from the foot of a hill, saying little, but often praying silently. They had now nothing to do but to prepare the food, which the men devoured in their short intervals of repose.