Drift

His shoulder was worse. He’d slept four hours on the corridor floor outside operations, his suit unzipped to the waist, his head on a supply pack someone had left there or that he’d pulled from the pile without remembering. The shoulder had seized overnight into something specific. A hot wire running from the joint into the neck when he moved it, pain that his diagnostic would have opinions about if he asked, which he wasn’t going to do in a corridor where three families were sleeping and the atmospheric readout on his portable was showing forty-seven percent.

Down from forty-nine. The filters.

He checked the structural readout. The mount: stable. The thermal differential: holding within a degree of where it had been at 0347. The bypass: running, pulling from sections five and six, the rerouted intake still doing what he’d crawled through conduit to make it do. The numbers weren’t good. They were the same numbers from last night, with the filter degradation shaving points at a rate he could model but not stop.

The station was awake. Or it had never fully slept. People in the corridors, the compressed community fitting itself into the rhythms of the day after. A woman distributing water rations at the junction. Two men checking a cable run that had been repaired during the crisis and needed checking again because repairs done at 0200 under emergency lighting had a reliability profile all their own. Someone had put a child to work organizing medical supplies in the compartment across from operations, and the child was doing it with the focus of a person who had been given a task that mattered.

He needed coffee. The station didn’t have coffee. The Paran had coffee but the Paran was on the dock and the dock was forward and forward was cold and the coffee wasn’t worth the transit time through sections where the temperature had dropped below what his suit was currently calibrated for because he’d unzipped his suit because he’d been sleeping. He ate a ration pack from the crate in the junction. It was labeled with a brand he didn’t recognize and it tasted like compressed protein with the idea of flavor added by someone who had heard flavor described but never experienced it firsthand. He ate it standing, because sitting down would require getting up again, and getting up was currently a negotiation between his legs and his lower back that his legs were winning only because the lower back hadn’t fully woken up yet.

He did rounds. Yesterday’s patients holding, except the bronchial cases. Three of the four had developed a wet cough overnight, the bypass air degrading their respiratory function at a rate that was predictable and untreatable with the medication he had left. He adjusted the bronchodilator doses and moved on.

Dahl was at the filter housing when he checked the bypass. Her left hand tremored against the housing release and she compensated without looking at it.

“How long?” Lev said.

She knew what he meant. “I’ll need to rotate again by tonight. After that.” She didn’t finish. After that was the part that needed parts they didn’t have.

He found Koss in operations. She was running logistics on her portable, the schematic on the display behind her, the red sections still red. She looked like someone who had slept less than he had and had been awake longer and was not interested in discussing either fact.

“Supply run,” he said. “The filters need parts we don’t have. The bronchial cases need medication I’m running low on.”

“I know.” She’d already been working it. “Nearest supply point is Karsten Platform. Four days each way at a reasonable burn.”

“That’s a long time on degrading filters.”

“Breck says he can extend them. Cleaning, reseating, the same rotation you did yesterday but more aggressive.”

“He can extend them a few days. Maybe a week if the loading stays even, which it won’t, because the adapters don’t seat the filters evenly.”

“So tell me a better option.”

He didn’t have one. The nearest supply point was eight days away. The nearest supply point with the specific filter type this recycler actually needed probably didn’t exist, because the recycler had been rebuilt three times from non-standard parts, and the filters it used were adapted from a different system entirely, and the adapters that bridged the gap were custom work by Breck that nobody else could replicate without Breck’s hands and Breck’s knowledge of this specific machine, which meant that even if someone made the eight-day run and found filters, they’d need Breck to make new adapters, and Breck was here, maintaining the station, because someone had to maintain the station, because the station didn’t maintain itself, because nothing out here maintained itself.

“I’ll work the numbers on the filters,” he said. “Get the supply run moving.”

Koss nodded. Already past it. She had a list of problems with solutions and a list of problems without, and she was working the first list because that was the list with action items.

He headed for Mirin’s compartment.

The hatch was open this time. She was inside, at her console, working. Not the frantic work of the crisis or the blank aftermath. The steady, methodical work of a clinician doing what clinicians did after: logging, reviewing, updating the records that held the system together because the system was the records and the records were Mirin and Mirin was here, at her console, at six in the morning or whatever passed for six on a station whose lighting schedule had been interrupted by forty hours of emergency operations and hadn’t been reset.

She heard him at the hatch. Didn’t look up.

“I need your updated profiles on the bronchial cases,” he said. “The bypass air is getting worse and I need to know where their respiratory limits are.”

“I have them.” She saved what she was working on. Turned. “Come in.”

The compartment was the same three by four meters he’d first seen, every surface working. But the crisis had rearranged her systems the way it had rearranged everything on the station. Gaps on the medication shelves where supplies had been used and not replaced. The refrigeration unit running louder than it should, the compressor cycling harder, and someone, Mirin probably, had taped a note to the side: CYCLING EVERY 40 MIN CHECK TEMP. The note of someone whose equipment was misbehaving in a way she didn’t have time to diagnose but also couldn’t ignore, because the medications inside were keeping people’s cardiovascular systems from doing things the crisis had taught the cardiovascular systems to do.

She transferred the bronchial profiles to his portable. Walked him through the updates, patient by patient. Adjustments she’d made since last night. Limits identified. Where the dosages could go and where they couldn’t. Clinical. Precise. The same professional mode from when they’d negotiated the medication protocols two days ago, which felt like a number larger than two.

They worked through the cases. It took fifteen minutes. Neither of them mentioned Nika Vasik during those fifteen minutes. Different system. Different conversation.

Mirin finished the last profile update and closed the file. She pulled up another record on her console. Looked at it. Looked at Lev.

“Tell me what happened in section four.”

The professional version of the question, asked by someone who needed the clinical data the way Lev needed her medication profiles. Because she was the practitioner who had built Nika’s modification profile, and the profile had failed, and she needed to know how.

He told her. The compartment. The temperature, the atmospheric readings when he reached her. Finding her conscious, shaking, lips blue. The emergency atmosphere line, the mask, the clean air. Saturation at 84, not climbing. The stimulant at sixty percent, as Mirin had said. The numbers from there.

“Heart rate came down to 130 on the stimulant,” he said. “Saturation held at 82.”

“The vasodilator?”

“Low dose. Heart rate 125. Saturation dropped to 81.”

Mirin was writing. Not on the portable. On paper. She had a notebook, physical pages, the kind of thing nobody used because digital was searchable and backed up and didn’t require power from a grid that might go down and couldn’t be corrupted by a software update pushed from a platform that hadn’t consulted the people using the software, except that physical paper also couldn’t be corrupted and didn’t require power and didn’t sync to a network that might not exist next week, which was why Mirin used paper.

“The oxygen uptake,” she said. “The enhanced absorption. It wasn’t engaging.”

“No.”

She stopped writing. Her pen was an actual ink pen, the cap on the wrong end because it always ended up there. She was looking at the wall behind her console. The shelves, the labeled bottles, the gap where a bottle had been used during the crisis and not replaced. Whatever she was seeing wasn’t in the compartment.

“I profiled her two months ago,” Mirin said. “Cardiovascular numbers were within my parameters. Heart rate, blood pressure, variability. All where I expected for a nine-year-old third-gen with her parents’ profiles.”

“Within your parameters.”

“Mine. Not the standard. My standard is adjusted for this population. I built it from fifteen years of measuring these people. The standard protocol’s cardiovascular baseline for a nine-year-old third-gen is based on data from stations with full biotech support, regular modification maintenance, controlled environments. Those populations aren’t this one. This one has been self-maintaining for two and a half generations with my resources, which.” She stopped. Started again. “Which were limited before I lost the lab.”

The bio lab. In the forward ring. The section that had been open to vacuum for three days.

“What did you have in there?”

“Fifteen years of tissue samples. Culture work on the pediatric modification expressions. Growth hormone assays. Bone density series. The equipment to run longitudinal comparisons that I can’t run from a three-by-four compartment with a diagnostic suite and a refrigerator.”

She said it flat. A list. If she stopped on any single item the whole exercise would collapse.

“The records are here,” she said. “Clinical files, profiles, notes. Everything portable. The lab was the part that let me test what the records were telling me.”

“What were the records telling you?”

She didn’t answer directly. She pulled open a drawer beneath the console and took out a stack of paper charts. Physical charts, plotted by hand, grid lines drawn with a ruler, data points in colored inks that corresponded to a legend in the margins. Growth charts. She laid three of them on the console surface, overlapping.

“Three of my pediatric patients. Height and mass, birth to current age. The dotted line is the expected trajectory based on their parents’ modification profiles and the standard third-gen developmental model.”

Lev looked at the charts. He could read growth curves. It was part of the work, assessing whether a child’s development was tracking the modification profile. The dotted lines described clean arcs. The solid lines, actual measured data, followed the arcs closely for the first few years.

Then they diverged.

Not dramatically. A few percentage points per year, the actual values falling below the predicted trajectory. The kind of drift that could be dietary, environmental, the normal variation in a small population. Each individual chart was unremarkable. A clinician looking at any one of them would note the divergence and move on.

Three charts together was different. The same drift. The same direction. The same inflection point, somewhere around age five or six, where the actual curve started pulling away from the predicted curve and didn’t come back.

“I have eleven more,” Mirin said. “Every child on the station born in the last twelve years shows a version of the same pattern. Some more pronounced. Nika was in the middle of the range.”

He looked at the charts again. The cardiovascular markers Mirin had tracked alongside the growth data, noted in her cramped handwriting in the margins, showed a parallel drift. Heart rate variability declining from the predicted range. Oxygen uptake efficiency below the inherited modification standard. Not by a lot. By the kind of margin that could be explained away if you looked at one chart, or two, or even three.

Fourteen was harder to explain away.

“You adjusted for this,” he said.

“I adjusted for what I could measure. The metabolic rates, the dosage sensitivities, the growth parameters. That’s what the profiles I gave you reflect. My parameters, not the standard.”

“But the oxygen uptake.”

“I couldn’t test oxygen uptake at the cellular level without the lab. I could measure saturation, I could measure response to exercise, I could compare against the population I’ve been observing for fifteen years. What I couldn’t do was assess whether the enhanced uptake pathway was fully expressed at the tissue level, because that requires microscopy and culture work and equipment I no longer have because it’s in a room without atmosphere.”

She said it without bitterness, because it was a fact. The fact had been true for three days and she’d been living inside it the way she lived inside every constraint on her practice.

“If you’d had the lab,” Lev said. “Would you have caught it?”

Mirin looked at him. The question was not simple and they both knew it. Would she have tested every child’s cellular oxygen uptake expression? With the equipment she had, the time she had, the eighty people whose modification profiles she maintained alone?

“I don’t know,” she said.

The compartment was quiet. The refrigeration unit cycling. The station sounds from the corridor, attenuated by the rock walls. Something that might have been footsteps or might have been thermal settling in the ductwork.

Mirin picked up one of the charts. She looked at the divergence curve. The solid line pulling away from the dotted line, the gap widening year by year in increments small enough to explain and consistent enough to worry about.

“The profiles I built work,” she said. “For the things I can measure, in the conditions I measure them in. I’ve kept these people healthy for fifteen years. The medication protocols are right. The maintenance schedules are right. The adjustments I make are based on data and observation and they work.”

“I know that.”

“The protocols you carry assume a population I don’t have. I’ve been telling you that since you walked in.”

“I know.”

“What I didn’t know.” She put the chart down. “What I don’t know. Is how far the drift goes in the systems I can’t measure. How many pathways are underexpressing or overexpressing or doing something I don’t have a word for in ways that don’t show up in a clinical exam or a saturation reading but show up when a nine-year-old is in a compartment at twelve degrees with her partial pressure dropping and her cardiovascular system is asked to do the thing it was modified to do and it can’t.”

The sentence was long because the thought was long. Because the thought had been running since before the crisis, maybe, since the first time a chart showed her something she couldn’t explain and she’d adjusted for it and moved on because adjustment was the job.

Lev didn’t say the thing that was available to say, which was that nobody could have caught it. It might be true. It didn’t matter, because true or not it didn’t change anything about a girl who had gone to get a toolkit for the cable crew.

“What do you need?” he said.

“Equipment I can’t get. A lab I can’t rebuild with what’s here. A geneticist who doesn’t exist in a community of eighty-two people.” She gathered the charts and put them back in the drawer. “What I actually need is three years of resources I won’t get access to because requesting them means telling a network that has no jurisdiction and no funding that a gray market bio tech on an unlicensed homestead has a population drifting in ways she can’t fully characterize, and the network’s response would be a review committee that would spend six months discussing the regulatory implications while the drift keeps doing whatever the drift is doing.”

He heard something familiar in what she was describing. Not the same as Braga. Not a council debating authorization while people suffocated. But the same shape: the distance between a problem and the people who might address it, filled with process that moved slower than the problem. He didn’t mention it. Mirin’s frustration was her own and didn’t need his stacked on top.

“The supply run,” he said. “Koss is sending someone to Karsten Platform for filters and medication. If there’s equipment you need, I can add it to the list.”

Mirin considered this. Professional calculation, weighing what was worth requesting against what was realistic. “A basic microscopy unit. Culture media. Sampling kits.” A pause. “It won’t replace what I had. But it would let me start testing again.”

“I’ll add it.”

He stood up. The shoulder caught and he waited it out, which took about two seconds longer than he wanted it to in front of someone who read bodies for a living. Mirin was watching him with the assessment she’d turned on his diagnostic when he first arrived. Now she was looking at his shoulder.

“When did that start?”

“A while ago.”

“Before the call?”

“Yeah.”

She didn’t push it. He didn’t offer. The familiar impasse of two people who treated everyone’s problems except their own, recognizing the condition in each other without any particular interest in addressing it.

He moved toward the hatch. Stopped. On the wall near the hatch, below the shelving, a section of composite panel he hadn’t looked at before. A photo, printed on thermal paper that was already fading at the edges. A group of maybe twenty people standing in a half-finished corridor, raw rock visible behind them. The woman at the center had a build like Koss’s and a face that didn’t look anything like Koss’s face except in the way she planted her feet.

“Mara?” he said.

Mirin glanced at the photo. “Koss put that up years ago. Mara had one in every section when the station was new. Most of them are gone. Koss reprints them when she finds the originals.”

He looked at the people in the photo for another second. They were looking at the camera with expressions he could read as determination or defiance or the knowledge of exactly what they were building and how hard it would be, or they were squinting because someone had used a flash. He didn’t know which. He left it.

The corridor outside Mirin’s compartment was warmer than the last time he’d been through, or he’d acclimated, or both. A man passed him carrying a section of duct housing that looked like part of the bypass filtration system, and Lev wondered where Breck had sourced it and then stopped wondering because it wasn’t his concern and the man carrying it knew where it was going.

In the junction, the child who’d been organizing medical supplies was finished and sitting against the wall eating a ration pack, her feet not reaching the deck. She looked up when he passed. Looked back down at her food.

He checked the atmospheric readout on his portable. Forty-seven percent. The same number from this morning, still holding. He added Mirin’s equipment request to his notes for the supply run. Microscopy unit, culture media, sampling kits. He’d give the list to Koss. The supply run would go. It would take eight days, and in eight days Mirin would have equipment that let her measure some of what she couldn’t currently measure, which was the gap where the profiles she’d built over fifteen years stopped being enough.

He walked back toward the junction. Patients to see, filters to manage, a station to keep running for eight more days on systems designed to run for two. The work was the work.

He passed the compartment where Fen Vasik had been sitting the night before. The hatch was closed.