For some minutes the luckless Hans Koppe was subjected to a severe dressing-down by his hot-headed officer, and when at length the seaman rejoined the lads he was in no humour to resume conversation.

Slowly the minutes sped. The submarine was still rolling sluggishly, in spite of the fact that more water had been admitted into the ballast tanks.

The men were talking seriously amongst themselves. From scraps of conversation that drifted to the lads' ears, it was evident that they had grave doubts concerning the ability of the diver to perform his task, and even of his chances of regaining the submarine, owing to the violent disturbances of the water.

Presently the motion of the anchored submarine became more acute. A weird grating sound—the noise made by the hull rasping over the bed of the sea—was distinctly audible.

One of the seamen produced a pocket compass. His startled exclamation brought other members of the crew around him. The magnetic needle was apparently describing a semicircle. U75 was swinging round her anchor.

Just then a bell tinkled, and a disc oscillated on the indicator board on the bulkhead. Instantly the two men who had been told off as attendants upon the diver hurried aft, while their companions crowded expectantly around the door.

The two men came back, staggering under the weight of the diver. They had already removed his head-dress and leaden weights. Water dropped from his rubber suit. His face was livid, his eyes wide open and rolling. One of his bare hands was streaked with blood that flowed sullenly from a cut in his numbed flesh.

Kapitan Schwalbe and Leutnant Rix followed him into the crew-space. It was not through feelings of compassion that they had come for'ard. It was acute anxiety to hear the diver's report.

The luckless man was laid upon the mess-table. His attendants divested him of his diving-suit, and rubbed his body with rough towels. A petty officer poured half a glass of brandy down his throat.

"What is amiss?" Kapitan Schwalbe kept on repeating.