He felt as if his heart would burst long before he gained the upper deck. That organ was indeed thudding heavily against his ribs, while the veins in his forehead, on his hands and face, were distended and purple. But there was pluck and determination to drive Mr. Dicky Hamshaw onward, while Hawkins was not the man to be beaten by an officer or to leave one in the lurch. And so, after a struggle which cost them dear, they won their way to the summit of that tiresome and never-ending ladder. A minute later, almost too fatigued to deliver a blow, they attacked the valves affixed to each of the many gas chambers, beginning with those at the centre.

"Frozen hard as rocks. Deck covered with frost and ice. The weight'll be an advantage. But how are we to get these valves open?"

It was difficult enough under that white covering to detect their presence, though, fortunately for all, both Dick and Hawkins had more than once examined the valves. Now they set to work with hammer and spanner, breaking away the coating of ice, and smashing the firm joint which the intense cold had formed round each seating. It was with a shrill, half-stifled cry of delight that Dick contrived to free the first of the valves.

"Wide open. Can smell the gas coming out," he told himself. "That'll fix her. A few more will do the trick. Wish to goodness she'd remain level."

Something shot past him at terrible speed, and brought up hard against the rail at the edge of the deck. It was Hawkins, pitched from his feet by a sudden lurch of the vessel, and saved from a dreadful dive into space by the rail against which he had cannoned. A second later his unconscious figure came hurtling back, and but for the grip Dick managed to fasten on him he would have shot over the side of the vessel in the opposite direction.

"Must go on alone, that's all," Dick told himself stubbornly. "Big job, but got to be done. I'll place Hawkins in the entrance to the liftway."

He dragged the unconscious figure after him, helped not a little by a sudden tilting of the vessel. Then, stowing him in a corner from which he hoped he would not be dislodged, he raced along the deck again, himself took a header as the deck sloped steeply, caught a stanchion to which one of the wireless supports was attached, and a moment later was beating frantically at a second valve. In ten busy minutes, in fact, he contrived to release no fewer than five, and had the satisfaction of smelling the gas which at once poured out of them. More than that, a glance at the summit of the mountain showed him that the ship had fallen already. She was resting just a trifle above that wet, cold blanket which enveloped the central part.

"And a chap feels less blown than before," thought Dick. "That's satisfactory. Now for the engines. Must get 'em going and way on the ship, for this gale is playing the dickens with her."

It was a way of expressing his meaning, and indeed, even now that he had accomplished his purpose so bravely, his work was likely enough to be defeated by outside influences. For the whirlwind had not abated, and three times while Dick worked had the ship been swept past the slopes of Mount Everest, at such speed that, had she struck, she would have crumpled up like a concertina. Now she was caught again, spun round like a top, sent twirling from the mountain, only to be driven back again till her bows actually collided with one of the slopes. But it was only a glancing blow, and the snow happened to be both soft and deep. Shivering, therefore, at the shock, she shook herself free, and shot off into the open.

As for Dick, he raced to the deck below, his respiration already decidedly easier. Stepping over the still unconscious figures of his comrades, he gained the engine-room and tackled the task of starting the engines.