John Mackenzie, the hero of this story, writes in regard to the converted yachts used for dropping depth bombs in European waters as follows: "Only destroyers made speed exceeding 25 knots. There were no converted yachts operating in European waters capable of making 25 knots. A very few made 15 to 18 and the majority about 12. Of course we had to take our chances in getting away safely, although we knew that the chances were about even. That is, we were in about as much danger from our depth charges as the enemy was." His statement shows the risks that American sailors were willing to take. The bomb, of course, weighs over one hundred pounds. It is made with one end flattened, upon which it will stand, and in the early types its accidental discharge is rendered practically impossible by a sort of peg called a safety pin, which must be removed before the bomb is dropped. The use of depth bombs against the U-boats made fighting in the German submarines so dangerous and so much to be dreaded, that it is said, as the war drew to a close, all U-boat crews had to be forced into service, and that none of them expected ever to return and see their homes and friends again. In the early days of the war the bombs were carried in cradles, and later in racks or run-ways. From most of the bombs the detonator, which would fire them, was removed; but some were kept ready for instant firing, near the stern of the ship. The early type of bomb was discharged by a length of wire attached to a float. The bomb itself sank, the float remained on the surface of the water and reeled off the wire until the pull upon it discharged the bomb. It can be readily seen that the depth at which the bomb was discharged would depend upon the length of wire attached to the float. Imagine what might follow if one of these bombs, set ready for discharge, should break loose from its case in a storm at sea. Such a terrible accident did happen on the U.S.S. Remlik. The ship was groaning and tossing in a very heavy sea, for a severe storm was raging. She gave a lurch and pitched back with so much force that a wooden box, containing a depth bomb and securely fastened to the after deck, suddenly broke. The bomb rolled out of the box and began to bound back and forth across the deck as the ship lurched and pitched from side to side. The crew seemed stunned, and no orders were issued for concerted action. The frightfulness of the situation was greatly increased when it was observed that the safety pin had dropped out. All expected the next time the bomb struck with force against the rail that the float section would be released and reel off enough wire to fire the detonator and utterly destroy the ship and all aboard.