Lord Hastings again raised his voice and a sailor came running to him. The commander of the vessel turned the lookout over to him and rushed to where he had left Frank and Jack. When Frank had gone to his friend's assistance, he had thought that together they would have little trouble overcoming the German officer. But the latter, in spite of Jack's strength and all that Frank could do, was giving a good account of himself. Blow after blow he landed upon each of the lads, but none had the power behind it to put them down. Time after time the two lads had closed in on him, only to be shaken off for the German was as slippery as an eel. But finally Jack succeeded in gaining a strangle hold on the German, and putting forth his greatest strength, bore him to the floor, where both lads piled on top of him, pinioning his arms and legs. It was at this moment that Lord Hastings appeared upon the scene and rushed forward to lend a helping hand. In falling the German's head had come in violent contact with the floor, and he now lay still. "Tie him up quickly," commanded Lord Hastings. "We haven't any time to waste on him." Jack and Frank hastened to obey, and soon the captive was securely bound. The two lads noticed the signs of anxiety on their commander's face and Frank asked: "What's the matter, sir?" "Matter is that we are in a veritable nest of the enemy," replied Lord Hastings. "Also our periscope has been shot away." "But we can rig up the other in no time," said Jack. "So we can," said his commander, "but in the meantime they are likely to send a flotilla of submarines below to look for us." "Then we shall have to hustle," said Frank. "Hustle is the proper word," agreed Lord Hastings. "Come with me." He led the way to the foot of the broken periscope, and quickly summoned several members of the crew. With all possible haste the second periscope, carried for just such an emergency, was brought out and run up. "The only way we can tell whether it is adjusted properly," said Lord Hastings, "is to rise, and that is exceedingly dangerous." "Well, we shall have to take a chance," said Frank. "So we shall," was the reply. "You may give the order, Mr. Templeton." Jack did as commanded, and slowly the submarine began to rise. Lord Hastings stood at the foot of the second periscope, peering intently into it. At last he raised his hand in a sudden signal, and immediately the vessel began to sink again. "It's all right," said the commander, turning to the lads. "I caught a glimpse of the surface." "Then we are all fixed again," said Frank thankfully. "Yes." "Then," said Jack, "I should say the thing to do is to put as great distance as possible between us and the enemy." "The only draw back to that," said Lord Hastings, "is that I do not know just where we are and to move in any direction is decidedly dangerous." "Weren't you able to recognize the surroundings?" asked Frank.