And outside that foul transparent pit the tempo quickened also. The sledging blows at the last door came quicker. All around the captive _Peary_ the sleek brown bodies stirred uneasily. For weeks there had been but little activity inside the submarine; now, all at once, three of the figures that were men whipped the others into action, rousing those lying dying on the deck--working, working. Observing this, the lithe seal bodies moved with new nervous, restless strokes, to and fro, never pausing--passing up and down in a milling stream the length of the craft, clustering closest outside the walls of the fourth compartment, where they pressed as close as they could, their wide brown eyes already on the haggard forms that worked inside, their smooth bodies patterned by the constantly shifting shadows of their fellows above and behind. So they watched and waited, while in the third compartment the battered torpoon was slung at the last door, and drawn back, and slung again--waited for the final moment, the crisis of their month-long siege beneath the floes of the silent Arctic sea! * * * * * Kenneth Torrance worked by himself. He saw that Sallorsen and Lawson had answered his call; man after man was clad in his suit and sucking in the incomparably fresher, though artificial, air of the units. As he had hoped, that air was revitalizing the worn-out bodies rapidly, giving them new strength and clearing their brains. His plan required that--strength for the men to move and act for themselves--sane heads! The plan was basically simple. Bringing his best concentration to the all-important details, Ken started to build the road to the world above. First he opened the inner door of the starboard port-lock, wherein lay his torpoon. Opening the entrance panel of the steel shell, he quickly transferred within the cans of compressed food retrieved from the second compartment. When he had finished, there was left barely room for the pilot's body. And then the nitromite. The explosive was carried by the _Peary_ for the blasting of such ice floes as might trap her. It was contained for chemical stability in a half dozen six-inch-square, water-proof boxes, strung one after another on an interconnecting wired rope. Ken would need them all; he wished he had five times as many. It would not matter if the whole of the _Peary_ were shattered to slivers. Ken tied the rope of boxes into a strong unit, as small as it could be made. Firing and timing mechanisms were contained in each unit: he would only have to set one of them. He wrapped the whole charge, except for one small corner, in several pieces of the men's discarded clothing--monkey jackets, thick sweaters, a dirty towel--and stuffed it in an empty tin container for sea-biscuits. * * * * *