Taken at a disadvantage Jack struggled in vain to free himself. He was at a further disadvantage also, for the spy, before going under, had caught a long breath; whereas Jack had gone under sputtering and gasping. But help came to Jack from a source he did not expect. When he had jumped into the sea in pursuit of the spy, Frank had done likewise, for he divined that Jack might have trouble recapturing the prisoner. While he was not such a powerful swimmer as Jack, he was nevertheless close at hand when the spy pulled his chum under. Frank acted without an instant's hesitation. Drawing his revolver and grasping it by the barrel, he also dived. Down and down he went, and then close beside him he became aware of the struggling figures. The water was very dark, but the lad could dimly distinguish the form of his friend from that of the spy. Going close, he raised his revolver and brought it down on the spy's head with all his force. At the same time he stretched forth his other hand, and seized the spy by the shoulder. Freed of the hold on his legs, Jack immediately shot to the surface, where he filled his lungs with fresh invigorating air. A moment later Frank, still grasping the spy by the shoulder, appeared by his side. "Lend a hand," he called, "and we'll get him back aboard." Jack, now greatly refreshed, did as his chum ordered and the two lads, supporting the body of the spy between them, swam back to the submarine, where willing hands helped them over the side. Lord Hastings immediately took charge of the spy. "Stretch him out there till he recovers consciousness, and then proceed with the execution," he ordered. The body of the spy was stretched out on the deck, and two sailors bent over him. Then one started back, and took off his cap. "The execution will not take place," he said. "What do you mean?" said Lord Hastings. "Is he----" "Yes," interrupted the sailor, "he is dead." "By George!" muttered Frank, "that blow over the head." "No," said the sailor, "it is the water that did for him." "I'm glad of that," said Frank simply. "Prepare the body for burial immediately," ordered Lord Hastings. "We'll remain on the surface until after he has been buried, then we'll submerge and continue our course." The work of preparing the spy's body for burial was only a question of minutes, and when it had been turned over to the mercies of the sea, Lord Hastings gave the command: "Submerge immediately, Mr. Templeton." All descended from the bridge, the little vessel was made snug and comfortable, and disappeared from the surface of the sea. "Shape your course due east, Mr. Templeton, and steam at 7 knots," ordered Lord Hastings. "Mr. Chadwick, you will take your post and watch for mines." "Very good, sir," replied both lads, and departed on their respective duties.