I had heard enough, and, without their realizing my presence, I returned to the control room. I considered the situation, and came to the conclusion that they suspected nothing, but it was evident that their minds were running on lines of thought which might be dangerous. I looked at my watch and saw that there was still two hours of daylight left, and then decided to play a trick on them all. I relieved the First Lieutenant at the periscope, and when a decent interval of about half an hour had elapsed I saw a ship. This vessel of my imagination, a veritable Flying Dutchman in fact, I proceeded to attack, and, after about twenty minutes of frequent alterations of speed and course, I electrified the boat by bringing the bow tubes to the ready. The usual delay was most artistically arranged, and then I fired. With secret amusement I watched the two expensive weapons of war rushing along, but destined to sink ingloriously in the ocean, instead of burying themselves in the vitals of a ship. An oath from myself and an order to take the boat to twenty metres. With gloomy countenance I curtly remarked: "The port torpedo broke surface and then dived underneath her, the starboard one missed astern." So far all had gone well, but ten minutes later I nearly made a fatal error. We had been diving for several hours, the atmosphere was bad, and as it was dusk I decided to come up, ventilate, and put a charge on the batteries. I gave the necessary orders, and was on my way up the conning tower to open the outer hatch. The coxswain had just announced that the boat was on the surface, when a terrible thought paralysed me, and I clung helplessly to the ladder trying to think out the situation. It had just occurred to me that as soon as the officers and crew came on deck they would naturally look for the steamer we had recently fired at; this ship in the time interval which had elapsed would still be in sight. As I came down, the First Lieutenant was at the periscope, looking round the horizon. Quickly I thrust the youth from the eyepiece, and, as calmly as I could, said: "I thought I heard propellers." Half an hour later we surfaced for the night. I have been wondering ever since whether they suspect, for the three of them were talking in the wardroom after dinner and stopped suddenly when I came in. I must be careful in future. * * * * * I was sent for this morning by the Commodore's office, and handed my appointment as Senior Lieutenant at the barracks Wilhelmshafen. No explanation, though I suspected something of the sort was coming, as three days after we got in from my last trip I was examined by the medical board attached to the flotilla. So I am to leave the U-boat service, and leave it under a cloud! It is a sad come-down from Captain of a U-boat to Lieutenant in barracks, a job reserved for the medically unfit for sea service.