There was no help for it. Once below the captain said: "You will save yourself considerable trouble by removing the fuse from the forward bomb, and that without further waste of words." The officer knew that the manner in which the words were uttered meant business. Without waiting for the second warning, he led the way, opened another secret door, and removed the tell-tale fuse. "Ah, ha! cut for two hours! Now, while we are about it you might as well start the motor; we have some use for it," said the captain. "I cannot do that," replied the officer. "So you succeeded in injuring it," said the captain. "No," was the reply. The captain picked up the tool, which Alfred was so particular to carry along. "And what was this used for?" he asked. "Yes; I have disarranged the motor fields so that they are useless; and I don't deny it," said the officer, straightening up and looking at the captain defiantly. "There; that is something like it; but you haven't deceived me in the least. I have brought a very useful article with me," continued the captain, drawing from his pocket a paper and presenting it to the officer. "It contains instructions, which I expect you to follow, for your own safety. I shall see to it that the fuses you removed are again put into place and the mechanism set for one hour. Of course, I shall hold the keys. Under those conditions you may remain locked below, and I shall expect you to obey my signals, as we intend to navigate the vessel to port, which will, as you know, occupy about fifty minutes of time. Do you know where the fuse boxes are?" said the captain, turning to the boys. Ralph marched to the side wall and pointed to the place where the sub-lieutenant opened the first box. "Open it!" ordered the captain, turning to the sub-lieutenant. The latter hesitated. The captain stared at him sternly and repeated the order. As he made no motion, the captain continued: "Why do you hesitate?" CHAPTER XI OPERATING THE SUBMARINE WITH A CAPTIVE CREW The officer now saw that he was dealing with a man who understood the motives of those aboard the submarine, and it was also evident that the sympathy of the boys was turned from the young man. The latter had played his part to the ultimate. "You have now done all and more than is required of you," said the captain, as he altered his tone of voice. "You have set the automatic device, which, in due time, would have sent this vessel to the bottom. I understand all these devices, and they will not avail you. I understand, as well as you do, that to open that box will cause an explosion; but it is necessary to make an example of you." Then, turning to the boys, he said: "You may go on deck. As for you, Mr. Officer, I shall detain you below a sufficient length of time to be sure that the automatic device gets in its work. We really have no use for the submarine."