They increased their pace a little. Imagination stimulated their weary muscles. The Narwhal! Men of their own kind! Sun and air! Life again! Ken could have shouted when he saw his partner stop and gesture excitedly before a dark spot in the wall. It could be nothing but the entrance to a trap.

He pressed forward, flicking on his flash and making sure by the water-waved beam it threw. But Beddoes was attending to some sight down the corridor; and suddenly he pointed in fright. The first torpooner looked in the indicated direction and saw what was meant.

Approaching was a wave of menacing brown-skinned bodies, streaming swiftly through the passage several abreast. Their escape had been discovered. The blubber-men were coming.

At once Ken acted, pushing Chan into the narrow opening and scrambling after himself. They wormed along for several feet, till they emerged in a large dark chamber at the far end of which was a big circular entrance barred by three great pale stakes. They were certainly in a whale trap.

Rapidly Ken played his flash around, looking for the torp, but it was nowhere visible. To one side was an out-jutting rock with a niche beneath it. It was a promising place and he stumbled his way there, followed by the other.

It was then that a most peculiar feeling came over him, a feeling that was instantly a surge of panic. Something else was in the trap! His flash arced around and up, and what lay revealed in its ray caused cold shivers to run down the backs of the two men.

Above them, just over the three-toothed outer entrance, hung a black, sleek body, white-striped. Head-on it was, and motionless, eyeing them. A killer whale—alive!—and poised for a lunge!

It barred the way to the outer entrance. They could not retrace their steps; already the round brown head of a blubber-men showed in the inner entrance. They were trapped, front and rear, and confronted by the deadliest animal in the sea.

A second they watched it, frozen immobile; then the whale's great body curved and its flukes went up, and by purest instinct the men dove for the niche at their feet. Head to head, they arrived in it, and just in time, for the great jaws of the killer barely missed their snap.

As the monster curved past, the swirling water of its passage nearly dislodged the torpooners, and they made haste to jam themselves into the crevice as tightly as they dared for the safety of their suits.