It is known, and word has gone out to all present, that the U-boat’s skipper—the last man to abandon ship—had the presence of mind to bring the boat’s Enigma machine with him. The RAF planes, still circling overhead, watched the skipper rise to a precarious kneel in his life raft and fling the wheels of the machine in different directions, into the steep pitches of hill-sized waves. Then the machine itself went overboard.