The man had been regarding them stolidly. He may not have understood Tim's insults, but the gestures were unmistakable. Without taking away his stare he spoke a brief command to one of the sailors who ducked below, reappearing with a rifle. Tim grew at once thoughtful, but Jeb, cowering lower, began to hurl abuses at him. He had warned him, he cried; and now see what was going to happen! Without further ado the sailor took deliberate aim and fired; the little nurse flinched, shuddered, and relaxed. Tim looked down at her with widening, almost unbelieving, eyes; then raised his face to the sky and, like a wounded animal, emitted one long howl. All of the plucky sergeant's grief, fury, self-condemnation--aye, and love--were in that wail of agony. The sailor was aiming for another shot when Jeb's ears were filled with a weird, screeching noise; a violent jolt of air almost knocked him from the box, and a geyser of spray shot up ten feet from the submarine's bow. Before even the deep boom of the distant gun that had fired this projectile reached him, another screeching followed, another jolt of air struck him in the face, and this time, with a mighty roar, the undersea boat split almost in two. Had not the officer and two sailors been so intent upon a petty revenge they might have seen, coming at express speed between themselves and the sun, a British fast patrol; however, it is difficult at best to detect spots against so dazzling a light--and there is, besides, the working of an all-powerful justice to be reckoned with! The two sailors, standing between their commander and the explosion, crumpled up as if they were air bags pricked with a knife; but the officer did not fall. He staggered once, nearly losing his balance, and then looked stupidly at the great hole into which roared a revenging sea. His U-boat was sinking fast; though by no agency from within. Those below would forever remain below; they had made their own grave, and their casket would be the steel monster which typified the steel-clad hand of another monster--their master! But the officer did not think so loyally of his master when he found himself about to face a Higher King. The steel-clad hand had forsaken him; even the German God--the "made in Germany" one which German professors and German pastors were loud in proclaiming as distinct and more refined than the God who watches over England, France and America--had now forsaken him. He felt the same impulse to howl that Tim had felt, although love and self-condemnation were not a part of it; only hatred. The water had reached his feet; with one more look around he sprang outward and began to swim.