Before digging into the ice, the captain had to obtain borings, to insure working in the best direction. Long bores were driven into the side walls; but after fifteen meters, the instruments were still impeded by the thickness of those walls. It was futile to attack the ceiling since that surface was the Ice Bank itself, more than 400 meters high. Captain Nemo then bored into the lower surface. There we were separated from the sea by a ten-meter barrier. That’s how thick the iceberg was. From this point on, it was an issue of cutting out a piece equal in surface area to the Nautilus’s waterline. This meant detaching about 6,500 cubic meters, to dig a hole through which the ship could descend below this tract of ice. Work began immediately and was carried on with tireless tenacity. Instead of digging all around the Nautilus, which would have entailed even greater difficulties, Captain Nemo had an immense trench outlined on the ice, eight meters from our port quarter. Then his men simultaneously staked it off at several points around its circumference. Soon their picks were vigorously attacking this compact matter, and huge chunks were loosened from its mass. These chunks weighed less than the water, and by an unusual effect of specific gravity, each chunk took wing, as it were, to the roof of the tunnel, which thickened above by as much as it diminished below. But this hardly mattered so long as the lower surface kept growing thinner. After two hours of energetic work, Ned Land reentered, exhausted. He and his companions were replaced by new workmen, including Conseil and me. The Nautilus’s chief officer supervised us. The water struck me as unusually cold, but I warmed up promptly while wielding my pick. My movements were quite free, although they were executed under a pressure of thirty atmospheres. After two hours of work, reentering to snatch some food and rest, I found a noticeable difference between the clean elastic fluid supplied me by the Rouquayrol device and the Nautilus’s atmosphere, which was already charged with carbon dioxide. The air hadn’t been renewed in forty-eight hours, and its life-giving qualities were considerably weakened. Meanwhile, after twelve hours had gone by, we had removed from the outlined surface area a slice of ice only one meter thick, hence about 600 cubic meters. Assuming the same work would be accomplished every twelve hours, it would still take five nights and four days to see the undertaking through to completion. “Five nights and four days!” I told my companions. “And we have oxygen in the air tanks for only two days.” “Without taking into account,” Ned answered, “that once we’re out of this damned prison, we’ll still be cooped up beneath the Ice Bank, without any possible contact with the open air!”