"Well, don't you think we had better abandon the ship and fly back to the camp?" suggested Billy.

"And leave that ship for them to rifle at their leisure—no," rejoined Frank, with lips compressed in determination, "we won't do that. We'll just go ahead and do the best we can—that's all."

"That's the way to talk," approved the professor, "now as soon as you boys have had breakfast we'll start for the ship, for, from what you have related, there is clearly no time to be lost."

The thought that their mysterious enemies might return at any time caused the boys to despatch the meal consisting of hot chocolate, canned fruit, pemmican, and salt beef, with even more haste than usual. Before they sat down to eat, however, Frank flashed a message to the camp telling them of their plight.

"Will start at once," was the reply, "keep up your courage. We are coming to the rescue."

This message cheered the boys up a good deal and they set out for the Viking ship with lighter hearts than they had had since the sighting of the night-flier. They packed with them plenty of stout rope, drills and dynamite. Harry carried the battery boxes and the rolls of wire to be used in setting off the charges when they were placed.

Arrived at the edge of the gully, a hole was drilled in the ice and an upright steel brace, one of the extra parts of the aeroplane, was imbedded in it as an upright, to which to attach the rope. It was soon adjusted and Frank, after they had drawn lots for the honor of being the first on board, climbed down it. He was quickly followed by the others, but any intention they might have had of exploring the ship at that time was precluded by the ice that coated her deck with the accumulation of centuries of drifting in the polar currents.

With the drill several holes were soon bored in the glassy coating and sticks of dynamite inserted. These were then capped with fulminate of mercury caps, and Harry climbed the rope to the surface of the narrow gully with the wires which were to carry the explosive spark. The others followed, and then, carrying the battery box to which the wires had been attached, withdrew to what was considered a safe distance.

"Ready?" asked Frank, his hand on the switch, when all had been adjusted.

"Let 'er go," cried Billy.