I have to deviate a little from the subject for the purpose of asking if my readers understand me. Is it above all plain, explicit, and clear why I give so much space to a discussion of the nerves when I speak about us, U-boat men, and so often refer to them? The nerves are in time of peace the Alpha and Omega for a U-boat officer. How much more so when we are at war! The nerves to us mean power to act, decision, strength, will, and perseverance. The nerves are valuable and to keep them in good condition is of the greatest importance and an obligation and duty during a voyage. There we sit hour after hour in the conning tower. Beneath is the most complicated mechanism the genius of man has ever created. And all around there are the most craftily constructed instruments for the purpose of destroying that which cost so much labor to create. Mines, nets, explosives, shells, and sharp keels are our enemies, which, at any moment, may send us high in the air or hundreds of meters into the ocean. Everywhere perils lurk. The whole sea is a powder barrel. For all this there is only one remedy—nerves! To make the right decision at the right moment is the first and last of U-boat science. One glance must be enough to determine the position. In the same second a decision must be made, and the commands carried out. A moment’s hesitation may be fatal. I can give an example of this on the very morning I speak of. It was three minutes after six o’clock, and within about half an hour the sun would rise, but the sea and the sky still floated together in the colorless drab of early dawn and permitted one only to imagine, not see, that partition wall, the horizon. Unceasingly our binoculars pierced the gray dusk of daybreak. Suddenly a shiver went through my body when—only a second immovable and in intense suspense—a dark shadow within range of the spy-glass made me jump. The shadow grew and became larger, like a giant on the horizon—one mast; one, two, three, four funnels—a destroyer. A quick command—I leap down into the tower. The water rushes into the diving tanks. The conning tower covers slam tight behind me—and the agony which follows tries our patience, while we count seconds with watches in hand until the tanks are filled, and the boat slips below the sea. Never in my life did a second seem so long to me. The destroyer, which is not more than two thousand meters distant from us, has, of course, seen us, and is speeding for us as fast as her forty thousand horse power can drive her. From the guns mounted on her bow flash one shot after another aimed to destroy us.