"Why, in a man's first enlistment," replied Lieutenant Jack, "the commanding officer is empowered to give him a summary dismissal from the service. Morton was in his second enlistment, or I surely would have dropped him ahead of his time. I'm glad he's gone." Ensign Eph had now finished his meal and was sitting back in his chair. Lieutenant Jack therefore gave the rising sign. "I want to show the midshipmen everything possible on this trip," said the very young commanding officer. "So we won't lie here in the mud any more. Mr. Somers, you will return to the tower steering wheel, and you, Mr. Hastings, will take direct charge of the engines. I will gather the midshipmen around me here in the cabin, and show the young gentlemen how easily we control the rising of a submarine from the bottom." Hal and Eph hurried to their stations. The midshipmen followed Jack Benson over to what looked very much like a switchboard. The young lieutenant held a wrench in his right hand. "I will now turn on the compressed air device," announced Lieutenant Jack. "First of all I will empty the bow chambers of water by means of the compressed air; then the middle chambers, and, lastly, the stern chambers. On a smaller craft than this we would operate directly with the wrench. On a boat of the 'Dodger's' type we must employ the wrench first, but the work must be backed up with the performance of a small electric motor." Captain Jack rapidly indicated the points at which the wrench was to be operated, adding: "I want you to note these points as I explain them, for after I start with the wrench I shall have to work rapidly along from bow to stern tanks. Otherwise we would shoot up perpendicularly, instead of going up on a nearly even keel. Mr. Hastings, are you all ready at your post?" "Aye, aye, sir," came back the engineer officer's reply. "On post, Mr. Somers?" "Aye, aye, sir." Lieutenant Jack applied the wrench, calling snappily: "Watch me. I've no time to explain anything now." With that he applied one of the wrenches and gave it a turn. Instantly one of the electric motors in the engine-room began to vibrate. Almost imperceptibly the bow of the "Dodger" began to rise. Lieutenant Jack, intent on preserving an even keel as nearly as possible, passed on to the middle station with his wrench. Just as he applied the tool the electric motor ceased running. "What's the matter, Mr. Hastings?" Jack inquired quietly. "Something blow out of the motor?" The submarine remained slightly tilted up at the bow. "I don't know, sir, as yet, what has happened," Hal Hastings answered back. "I'm going over the motor now." In a moment more he stepped into the cabin, a much more serious look than usual on his fine face. "This, looks like the man Morton's work," Hal announced holding a small piece of copper up before the eyes of the midshipmen. "Gentlemen, do you notice that the under side of this plate has been filed considerably?"