mainland,â Ziegler replied.
âBut where is he really?â
âThe wireless monitoring service has plotted the source of the signal, and he is definitely in London.â
Lorenz smiled at the young seaman. âEver been to London, Berger?â
âNo, Herr Kaleun.â
âA very fine city: Iâm particularly fond of the view from Greenwich.â
âPerhaps Iâll visit London after weâve won.â
Lorenz sighed with satisfaction. The chief had done it again. BBC propaganda was so prodigiously good for morale.
A RADIO MESSAGE FROM THE U-boat command center warned of several British destroyers in the vicinity. Lorenz gave the order to submerge, and U-330 began a silent run at forty metersâspeed one and a half knotsâjust sufficient to maintain depth. The subdued atmosphere in the control room was intensified by the red glow of the dark-adaption light. Lorenz and Müller were leaning over the chart table, conversing in low tones, when Hoffmann interrupted them. âExcuse me. Kaleun? The sound man wants a word.â
Lorenz nodded and climbed through the fore bulkhead hatchway. Thomas, the younger hydrophone operator, was turning the hand wheel and looking at the large dial located above it. The pointer swept from 220 degrees to 260 degrees, stopped for a moment, then rose until it was vertical. When Thomas saw the commander he said, âIâve been picking up something very odd, Herr Kaleun. Iâve never heard anything like it before.â
âOdd?â
âYes. And Iâve been wondering whether itâs some kind of long-distance detection system. Thereâs whistling and a sort of squeaking noise.â Thomas raised a hand and brought his fingers together. âLike when you squeeze a rubber toy. Itâs been intermittent. Thereâs nothing there right now.â Thomas offered Lorenz a pair ofauxiliary headphones. The captain took off his white cap, wrapped the metal arch around the crown of his head, and pressed the circular pads against his ears. Thomas began searching for the sounds again. His hearing must have been very acute because Lorenz saw the hydrophone operatorâs expression change from neutrality to excitement a few moments before he, Lorenz, detected the first faint whistle. âThere!â said Thomas. He continued to turn the hand wheel backward and forward, and as the range of these movements narrowed, the volume of the whistling increased.
Lorenz grinned. âNo, Thomas. Thatâs not some fiendishly clever Tommy invention. Weâre listening to dolphins.â The commander was captivated by the eerie charm of the sounds: clicks, whickering, peeps, and a low churr that accelerated and rose beyond the upper limit of human audition. Occasionally there were loud thuds as the dolphins bumped against the hull. Lorenz imagined the pod weaving through the water, tracing elegant, interlocking ellipses; playful, carefree, curious, circling their discovery. A stark contrast: the natural world, innocent and joyful, and the boat, malevolent and deadly. âYes,â Lorenz added while removing the headphones, âDefinitely dolphins.â He was about to leave when he noticed Thomas was frowning. âWhat?â
âItâs just . . .â The youth seemed about to raise some objection but changed his mind. âThank you, Kaleun.â
The hydrophone operator lacked experience, and Lorenz supposed that Thomasâs natural diffidence might make him overly reticent: he might feel foolish for having mistaken dolphins for a detection system and consequently fail to report something significant. Lorenz rested his palms on both sides of the doorway and leaned forward into the sound room. âWhatâs bothering you, Thomas?â
An inner struggle was taking place, and it was only after a lengthy pause that the youth finally mumbled, âI thought I heard words.â
âWords?â
âYes,