THE BALLAST WAR

The torch took the last inch of the bracket in a white line and the cut piece came away slow, turning once in the black water before it settled onto the wreck’s deck plate and stayed there. Mara Voss counted it down the way she counted everything at depth: weight, fall, no bounce worth naming. Three hundred metres. Thirty-one atmospheres on the hull around her and on her, and the water on the far side of her visor cold enough that the hot-water loop in her suit was not a comfort but an arithmetic — so many minutes of warmth bought, so many already spent. She killed the torch. In the sudden dark, lit only by her helmet lamp, the inside of the drowned rig looked the way it had looked for two hours: a working space somebody had built for air and daylight, drowned anyway, cross-braced and silted and patient.

“Cut’s done,” she said.

“Copy,” Delia Okonkwo said in her good ear, the right one. Surface-clear, unhurried. “Your picture from up here says you have the junction box two metres to your left and the open companionway behind it. The far bulkhead is beyond that, bearing steady. Nothing moving in the wreck with you.”

Mara turned left the way Delia said left, not the way her own ears would have sent her. That was the drill, and had been since the scar went into her left eardrum on a wreck not much shallower than this one and took the direction out of that side for good. Sound came to her left as weather — present, loud enough, useless for saying where it was. Her own breathing sounded like it lived behind her. The submersible’s pumps sounded like they lived everywhere. So she did not navigate by ear inside a steel box at three hundred metres; she navigated by Delia, whose surface picture was built out of choir-sonar worked the way Delia worked everything, thread by thread, each tender and instrument reporting in its drilled cadence until the separate returns wove into one moving account of the water column — where Mara was in it, where the wreck stood around her, where the current worried at the silt. Mara’s job was hands. Delia’s job was the picture. Confusing the two was how divers got found late.

“Junction box,” Mara said, when her glove found it, exactly where the picture had put it. “Reading the tag plate. Paint’s gone. Stamped numbers are good.” She read them off, slow, and heard Delia repeat them back into the surface log, and that was one more fixed point on the route — one more place a crew coming down in worse water than this would be able to stop, orient, and know where they stood.

The route was the work. Not salvage, not recovery, nothing with a price per kilo: a survey, cut and tagged and measured, through a wreck on the Louisiana shelf off the Mississippi Canyon, so that if the published tide table was true there would be a way in and a way out already proven when people needed it in a hurry. Three days. That was the figure she kept returning to, the way she returned to her air and her warmth: three days before the date printed at the top of the tide table, the first line of it, when the Ballastwrights said the Thale’s water would begin arriving in Earth’s seas on a schedule they had published themselves, politely, in advance. Water exchanged for water, theirs for ours, volume for volume, taken back as ballast to hold up trenches under a cooling star. Mara had read the table the way she read a dive plan — for the numbers that would be true whether she liked them or not. If it was true, this wreck sat close enough to the canyon head that the ground under it would be working ground, and a crew would want a route through it that had been cut by somebody with time to be careful. There was time now. There would not be then. So she was down here cutting doorways wider and tagging bulkheads while the water was still only Earth’s water, cold and black and ordinary, and the pay for it was clean, contracted, surface-signed money.

Money was the other set of numbers she kept straight at depth, because depth was where she earned it and the surface was where it went. The survey paid by the completed route, not by the hour, which suited her: hours could be argued about, a route either existed or it did not. This one, finished, closed out the winter’s short contracts and put the boat fund past the figure she had written on the inside of her locker door at the Verde Yard in Bayou Verde — not the whole price of a boat, not yet. One clean season: that was the want, stated the way she stated everything, in the units it would be paid in — one season of work on her own terms, on her own hull, diving her own judgment instead of other people’s wrecks on other captains’ schedules, the contracts hers to refuse, the debt she had carried since she was old enough to sign for it hers to finish. She was thirty-eight, and had been somebody’s hired depth since she was twenty. The season was not a dream; it was a sum with most of its terms already filled in, and this route, tag by tag, was filling in the next one.

“You’re drifting off station,” Quinn Avery said, from the submersible, close and dry through the comms. “Correcting. Hold your work a moment.”

Mara held. Quinn held the submersible on station outside the wreck’s broken flank, close enough that her umbilical ran fair, far enough that the hull’s wash did not stir the silt into soup around her, and they held it the way they held everything — seated, by feel. Quinn Avery did not dive open water; that was not modesty, it was a number they had been given and had built a working life inside of, the way a hull is built inside its rating. Sealed in the submersible, Quinn’s hands on the frame and the seat under them, changes of pressure and trim arrived in their body as information — the hull’s behaviour read through steel and inner ear, cross-checked against the current they could feel working on the vessel. Seated Descent, the discipline was called, and on a day like this it looked like nothing at all: a vessel hanging motionless in black water at three hundred metres while a diver worked a wreck beside it, neither drifting nor hunting. It was the reason the crew could be here at all, working at a depth that ate surface-supported divers’ bottom time in single minutes.

“Trim’s good,” Quinn said. “Hull’s happy. Continue when you’re ready.”

“Hull’s happy because you inspected it,” Mara said.

“Hull’s happy because I trimmed it after I inspected it. The two facts are related.”

It was law on this crew, older than the tide table: no descent happened in a hull Quinn had not personally inspected and trimmed — not late, not in a hurry, not for money, not because a liaison on the surface had a schedule printed on better paper than Quinn’s checklist. That morning, in Bayou Verde, Quinn had kept the whole operation standing on the dock for forty minutes while they re-trimmed a list nobody else could feel, and a tender had made the mistake of saying the word approximately within their hearing, and Quinn had looked up from the hull with the patience of a person explaining gravity and said that approximately was a word for other people’s funerals. Nobody had argued. Nobody on this crew ever argued, because the rule was not Quinn being difficult; the rule was the thing that let everyone else stop worrying about the hull and worry about their own work instead. The descent had happened on Quinn’s signature or not at all, and here they were, with the hull happy.

Mara moved on to the next cut.

The route plan, set on the surface, gave her four more tags to place and two more obstructions to cut before the line reached the far bulkhead and the vertical shaft that would be the route’s spine — up through the wreck’s broken core to the open water above its flank, where a crew ascending in bad visibility could find the tags by glove and follow them out. She worked the plan in order, because plans made on the surface by people who could breathe freely were smarter than improvisations made at depth by people who could not, and because Ellis’s old rule held: the dive is just the delivery of decisions already made. Cut, clear, tag. Measure the opening with the folding rule, call the number up, hear it written down. Move along the guide line hand over hand, silt rising in slow clouds around her boots and settling again, the wreck’s interior ticking and groaning the small sounds drowned steel makes as the cold works on it.

“Thermal check,” Ingrid Solberg said, on her turn in the comms rotation, with the flat timing of a woman reading a gauge she did not entirely trust and intended to verify. “Mara, your loop temperature and your window. Talk to me.”

“Loop’s warm at the chest, cooler at the left glove. Suit’s doing what you said it would do.”

“It will do it for another fifty minutes at this depth and this work rate,” Ingrid said. “Then your window closes, and it closes on my call, not on the work’s opinion. You are a body in a suit, and your Cold Limit was measured sitting still, not cutting steel. The gel at your shoulders is spent first — that’s by design, it tells you the truth early. When it goes cold against your skin, you are borrowing, and I don’t lend.”

“Copy,” Mara said. “Fifty.”

“Fifty,” Ingrid said, “and I will be counting in a voice you can hear at forty.”

This too was the crew’s ordinary machinery, as unremarkable to them as a tide chart: every diver’s Cold Limit a known, fixed fact of their body, set and not negotiable, and Ingrid Solberg’s work built around those facts the way a bridge is built around the weight it must carry. Hot water circulated through the suit from the submersible’s supply; gel packs, laid against the skin before the dive, held heat in reserve and gave it up slowly; the whole system sized and timed not against a hope that Mara ran warm but against the measured point at which a body with her numbers stopped being effective in cold water. Ingrid had piloted every version of the system on her own skin first — she rode each new circuit down the temperature curve herself, her cold tolerance the highest on the crew, found by feel where a lesser limit would fail, and set the warnings there. Every margin Mara worked inside had been measured against a person. That was why the crew trusted the numbers enough to forget them, fifty minutes at a time.

The fourth tag went on. The fifth. The first of the plan’s two obstructions stood between the companionway and the shaft: a fallen sheet of the wreck’s own plating, racked across the passage at the height of a diver’s chest, and the plan said cut it in two places and swing the freed sheet flat against the bulkhead where it would foul nothing. Mara braced, lit the torch, and cut. The work was loud in her good ear and directionless in her bad one, a white noise with a centre she located by the shake in her arms. The first cut went through clean. The piece hung on the second cut’s last centimetre of steel, and she killed the torch and took hold of it with both gloves to work it free by weight — and that was when she felt it.

The hull was humming.

Not loud. Not even, properly, a sound: with the torch off and her own breathing loud in the helmet, what came through her gloves where they gripped the pipe and the bulkhead beyond it was a vibration, faint and steady, a hum in the steel itself. She held still. Divers at three hundred metres do not indulge surprises; she ran the list the way she had been taught to run it, in order, against the facts. Her suit’s circulation pump cycled — no, the pump’s rhythm lived in her chest plate, and this lived in the wreck. The submersible’s systems, transmitted through her umbilical — no, the umbilical hung slack in open water and touched nothing of the wreck but her. Her own pulse in her gloves — she opened her hands, let the pipe hang, and put one glove flat against the bulkhead plating, palm open, fingers spread, the way you take the measure of a machine you suspect of running when it should be stopped. The hum was there. Under the glove. In the steel. Even, patient, and faintly — she made herself be exact, because exact was the whole job — faintly musical, the way a struck cable is musical for the first second, before it settles to a note.

“Delia,” she said. “Hold the picture a moment. I have something.”

“I’m holding,” Delia said. “Say it.”

“Vibration in the hull. Through the bulkhead plating, glove contact. Not my pump, not the umbilical. Steady.” She listened to her own report and disliked its thinness. “It wasn’t here at the start of the dive. Or I didn’t have a hand flat on this bulkhead at the start of the dive. Those are different statements and I can’t separate them from inside it.”

“Quinn,” Delia said, “your hull. Anything on your instruments, anything through the frame?”

A pause, in which Mara could hear Quinn doing the check properly rather than answering from the hip — the silence had its own information: they were looking, not dismissing.

“Nothing,” Quinn said. “Frame’s quiet, instruments are quiet, my seat says the water outside is doing what water does. If the wreck is humming, it’s not humming through anything of mine.”

“Surface,” Delia said, and Mara heard the shift in her register that meant the array was being re-tasked, threads re-assigned, the picture re-woven around a new question. “I’m putting the array on the wreck. Give me a minute, Mara. Keep your hand where it is if the window allows.”

“Window allows,” Ingrid said, before Mara could do the arithmetic herself. “Forty-one minutes. This counts as work, Mara, not rest. Your rate is up.”

Mara kept her glove on the steel and felt the hum run on, indifferent to being measured, and tried to do with it what she did with anything at depth: give it edges. It did not pulse with the current, and it did not follow the water’s ordinary movement around the wreck. It did not rise when she pressed and did not stop when she lifted her glove an inch off the plate and set it down again — it was in the metal, not in her. It was strongest, she thought, low in the bulkhead, toward the wreck’s keel and whatever the keel rested on, on a shelf that fell away eastward into the canyon. Beyond that, edges failed. It had no source she could point a lamp at. It simply was: a drowned rig, dead for years, holding a faint note in its bones, three days before any tide was due to arrive in this water and explain strange behaviour by being stranger.

“Array’s on it,” Delia said at last. “I have your position, I have the wreck, I have Quinn, I have the current picture. Mara, I have nothing else. There is no return in this water that isn’t accounted for. If that hull is making a sound, the sound is not reaching the water around it in any shape my instruments can pick up.”

“Copy,” Mara said. “Logging it as felt, not heard. Glove contact, bulkhead, lower plate. Time is—” she read the time off the dive slate strapped to her forearm, because times at depth are written down or they are invented later “—two hours eleven minutes into the dive. I’ll finish the cut, and I’ll put a tag on this bulkhead too, so the next diver’s hand finds the place.”

“Your window is thirty-nine minutes,” Ingrid said. “Finish is allowed. Lingering is not a category.”

She finished. The freed sheet came away slowly and swung flat against the bulkhead exactly as the surface plan had drawn it; the unscheduled tag went beside the humming bulkhead, at the height of a resting glove, and she noted its position in the route log in crew shorthand — here, hand flat, it hums. The last tags, the second obstruction and the final measured run to the shaft stayed on the plan for the next dive, and she called the route exactly what it was: cut so far, tagged so far, measured so far — not complete. The strain of the dive was on her by then in its ordinary, exacted way: a deep ache settled into her shoulders from hours of working against the suit’s resistance, her good ear ringing faintly from the torch work, the cold making its first honest claim at her left glove and along the gel-spent line of her shoulders, telling her Ingrid’s fifty minutes had been a measurement and not a pessimism. Her breathing had the managed quality of a thing being spent according to a table. None of it was injury. All of it was price, paid in the present tense, in the body.

The ascent was procedure, the way the descent had been: back along her own new route, hand over hand past her own tags, which was the survey’s first proof — the line read as clearly coming out as it had going in. Out of the wreck’s flank and into open black water, the submersible’s lights finding her. Into the lock, Quinn talking the whole way in their unhurried narrating voice — depth, trim, feeling — while the hull took her weight and sealed around her. Then up, in the staged patience of a planned ascent, her exposed body dictating the pace of a vessel that could have risen faster: stops held, times observed, the pressure coming off her joints and her ears by degrees, the good ear complaining and the bad one saying nothing she could use. At each stop Quinn read the state aloud. At each stop Delia’s voice came down with the surface picture. The cold left her slowly, in the reverse order it had arrived. The ache did not leave at all, and would ride up with her to the deck and into the evening, which was also in the table, and also paid.

On the long stop before the final rise, with the black already thinning toward grey above them, she made her report the way reports are made on this crew — plainly, in the order it happened, with the numbers first.

“Delia. For the log. At two hours eleven, glove contact on the lower bulkhead beside the shaft tag: steady vibration in the hull plating, felt, not heard. Not pump, not umbilical, not current. It was still there when I left the bulkhead. I want it in the survey as an observation, not an explanation.”

The comms held a silence with work in it — Delia, she knew, was not doubting her; Delia was checking, running the array’s record back against the time, thread by thread, and Quinn was checking the submersible’s own instruments against it, and Ingrid was closing the thermal window on a dive that had ended inside it.

Then Delia said, “It’s in the log, Mara. Word for word.” A pause. “But understand what I’m telling you, because I’ve run it twice. The choir-sonar heard the torch. It heard the pipe come away. It heard Quinn’s hull and your lock cycling and your breathing, when you were close to the hull, like you were in the next room. At two hours eleven minutes, and every minute around it — the surface has no instrument that heard it.”