When Mahlke swam breast stroke, the screwdriver bobbed visibly up and down between his shoulder blades, for it had a wooden handle. When he swam on his back, the wooden handle danced about on his chest, but never entirely covered the horrid piece of cartilage between chin and collarbone, which cut through the water like a dorsal fin, leaving a wake behind it.

And then Mahlke showed us. He dove several times in quick succession with his screwdriver and brought up whatever he was able to unscrew: lids, pieces of sheathing, a part of the generator; he found a rope, and with the help of the decrepit winch hoisted up a genuine fire extinguisher from the fo'c'sle. The thing – made in Germany, I might add – still worked; Mahlke proved it, squirting streams of foam to show us how you extinguish with foam, extinguishing the glass-green sea – from the very first day he was tops.

The flakes still lay in islands and long streaks on the flat, even swell, attracting a few gulls which were soon repelled, settled, and like a big mess of whipped cream turned sour drifted off toward the beach. Then Mahlke called it a day and sat down in the shadow of the pilothouse; and even before the stray tatters of foam on the bridge had time to lose their stiffness and start trembling in the breeze, his skin had taken on that shriveled, coarse-grained look.

Mahlke shivered and his Adam's apple jogged up and down; his screwdriver did dance steps over his quaking collarbones. His back, white in spots, burned lobster-red from the shoulders down, forever peeling with fresh sunburn on both sides of his prominent spinal column, was also covered with gooseflesh and shaken with fitful shudders. His yellowish lips, blue at the edges, bared his chattering teeth. But he tried to bring his body – and his teeth – under control by clasping his knees, which he had bruised on the barnacle-covered bulkheads, with his big waterlogged hands.

Hotten Sonntag – or was it I? – rubbed Mahlke down. "Lord, man, don't go catching something. We've still got to get back." The screwdriver began to calm down.

The way out took us twenty-five minutes from the breakwater, thirty-five from the beach. We needed a good three quarters of an hour to get back. No matter how exhausted he was, he was always standing on the breakwater a good minute ahead of us. He never lost the lead he had taken the first day. Before we reached the barge – as we called the mine sweeper – Mahlke had already been under once, and as soon as we reached out our washerwoman's hands, all of us pretty much at once, for the rust and gull droppings of the bridge or the jutting gun mounts, he silently exhibited a hinge or something or other that had come off easily, and already he was shivering, though after the second or third time he covered himself with a thick, extravagant coat of Nivea cream; for Mahlke had plenty of pocket money.

Mahlke was an only child.

Mahlke was half an orphan.

Mahlke's father was dead.

Winter and summer Mahlke wore old-fashioned high shoes which he must have inherited from his father.

He carried the screwdriver around his neck on a shoelace for high black shoes.

It occurs to me only now that, in addition to the screwdriver, Mahlke, for certain reasons, wore something else around his neck; but the screwdriver was more conspicuous.

He wore a little silver chain, from which hung something silver and Catholic: the Blessed Virgin; most likely he had always worn it, but we had never noticed; he certainly had it on ever since the day when he had started to swim in harness and to make figures in the sand while practicing his kick.

Never, not even in gym class, did Mahlke remove the medal from his neck; for no sooner had he taken up dry swimming and swimming in harness in the winter swimming pool at Niederstadt than he turned up in our gymnasium, and never again did he produce any doctor's certificates. Either the silver Virgin disappeared under his white gym shirt or lay just over the red stripe that ran around it at chest level.

Even the parallel bars held no horrors for Mahlke. Only three or four of the best members of the first squad were equal to the horse exercises, but Mahlke was right with them, leaping from the springboard, sailing over the long leather horse, and landing on the mat with Virgin awry, sending up clouds of dust. When he did knee-swings on the horizontal bar – his form was miserable, but later he succeeded in doing two more than Hotten Sonntag, our gymnastics champion – well, when Mahlke ground out his thirty-seven knee-swings, the medal tugged out of his gym shirt, and hurtled thirty-seven times around the squeaking horizontal bar, always in advance of his medium-brown hair. But it never came free from his neck, for the wildly agitated chain was held in place not only by his jutting Adam's apple but also by his protuberant occiput, with its thick growth of hair.

The screwdriver lay over the medal, and in places the shoelace covered the chain. However, the screwdriver did not outshine the medal, especially as the object with the wooden handle was not allowed in the gymnasium. Our gym teacher, a Mr. Mallenbrandt who was also assistant principal and was well known in sports circles because he had written a rulebook to end all rulebooks for the game of Schlagball, forbade Mahlke to wear the screwdriver around his neck in gym class. Mallenbrandt never found any fault with the medal on Mahlke's neck, because in addition to physical culture and geography, he taught religion, and up to the second year of the war guided the remnants of a Catholic workers' gymnastic society over and under the horizontal and parallel bars.

And so the screwdriver had to wait in the dressing room, over his shirt on the hook, while the slightly worn silver Virgin was privileged to hang from Mahlke's neck and succor him amid gymnastic perils.

A common screwdriver it was, cheap and sturdy. Often Mahlke, in order to detach a small plaque no larger than the name plate beside an apartment door, had to dive five or six times, especially when the plate was affixed to metal and the screws were rusted. On the other hand, he sometimes managed, after only two dives, to bring up larger plaques with long texts inscribed on them by using his screwdriver as a jimmy and prying screws and all from the waterlogged wooden sheathing. He was no great collector; he gave many of his plaques to Winter and Jürgen Kupka, who fanatically collected everything removable, including street markers and the signs in public toilets; for himself he took only the few items that particularly struck his fancy.

Mahlke didn't make things easy for himself; while we dozed on the barge, he worked under water. We scratched at the gull droppings and turned brown as cigars; those of us who had blond hair were transformed into towheads. Mahlke at most took on fresh lobster tones. While we followed the ships north of the beacon, he looked unswervingly downward: reddened, slightly inflamed lids with sparse lashes, I think; light-blue eyes which filled with curiosity only under water. Sometimes Mahlke came up without any plaques or other spoils, but with a broken or hopelessly bent screwdriver. That too he would exhibit, and always got an effect. The gesture with which he tossed it over his shoulder into the water, exasperating the gulls, was commanded neither by resigned disappointment nor by aimless rage. Never did Mahlke throw away a broken tool with indifference, real or affected. Even this act of tossing away signified: I'll soon have something more to show you.

…and once – a hospital ship with two smokestacks had put into port, and after a brief discussion we had identified it as the Kaiser of the East Prussian Maritime Service – Joachim Mahlke went down into the fo'c'sle without a screwdriver and, holding his nose with two fingers, vanished in the open, slate-green, slightly submerged forward hatchway. He went in headfirst – his hair was plastered flat and parted from swimming and diving; he pulled in his back and hips, kicked once at the empty air, but then, bracing both feet against the edge of the hatch, pushed down into the dusky cool aquarium, floodlighted through open portholes: nervous sticklebacks, an immobile school of lampreys, swaying hammocks, still firmly attached at the ends, overgrown with seaweed, a playhouse for baby herring. Rarely a stray cod. Only rumors of eels. We never once saw a flounder.