The sub-lieutenant moved cautiously to the rear, and in a few moments was abreast of the dining galley. Here he was within hearing of Alfred behind the aft trimming tanks. He saw the officer go to the door, and give three quick knocks. "Herr Schwoger!" he said in a subdued voice. In another moment a voice within replied: "The fuses; you must not forget them." To this the sub-lieutenant answered: "I have been ordered to remove them; what shall I do?" "Take out all but the forward fuse, and report," said the voice. "Tell us what has happened," continued the voice, which was now recognized as the doctor's. "They have complete command, and two warships are outside," was the reply. From this point the officer crossed over to the starboard side of the vessel and at a large stand-pipe stooped down. Alfred tried to ascertain what he was doing, but was unable to detect the nature of his work. The sub-lieutenant then crossed back to the other side, and, working his way quickly to the motors, stooped down. Ralph could no longer restrain himself. He quickly and quietly moved toward the officer, as he saw him with a long tool of some kind in his hand reach down to the base of the motor. "Hands up!" shouted Ralph. The tool dropped from the hands of the officer with a click. Alfred was at the side of the sub-lieutenant in an instant. "You may go on deck," said Ralph. The officer glanced at Alfred, whom he had seen emerge from the aft hiding place, and then turned a look of contempt on Ralph. "Move!" said Ralph, pointing to the gangway. Alfred cocked his revolver and menacingly pointed it at him. There was only one thing to do and he did it. He was met by the captain at the head of the stairway. The boys followed quickly. The captain looked on at the leveled revolvers and appeared to be surprised. "What does all this mean?" he asked. "It means that he tried to destroy the motors, and we caught him at it in time," said Ralph. "That is not so," replied the officer. "What is this for?" asked Alfred, as he held up the tool which the officer had dropped. "But you have removed all the fuses, of course?" said the captain, apparently not heeding the tool referred to. "I have," said the officer, straightening up. "All but the one at the forward part of the vessel," replied Alfred. The officer turned, with a look of surprise and chagrin on his face. "He does not know what he is talking about," said the officer. "Then you are lying to me as you are to the captain," said Alfred. "You told the doctor in the galley that you had removed all but the forward one. Did you lie to him?" asked Alfred. A blush seemed to suffuse the officer's face, as the captain said: "We will go down together. There may be some more work to do; come on," said the captain, as he indicated the way. "You may go first, Ralph, the sub-lieutenant will follow."