Drift

His shoulder was worse. The Paran’s bunk was better than the corridor floor but the crawl had done something the joint wasn’t going to forgive. He lay in the restraint net and felt the hot wire from the neck to the elbow and listened to Caro breathing in the other bunk and thought about twenty minutes to burn and the fact that they hadn’t taken it.

The atmospheric readout on his portable, synced to the station’s sensors, showed forty-seven percent. Down from forty-nine. The filters were still dying. The station was still dying. He got up and went back through the dock.

He did rounds. Not because the station deserved it. Because a woman in the junction was coughing and her bronchodilator dose needed adjusting, and the man with the cardiovascular irregularity needed checking, and the bypass air was getting worse for eighty-two people who hadn’t decided to kill anyone. He treated them the way he treated everyone, and if his hands were rougher on the equipment and his voice was shorter than it had been the day before, nobody mentioned it.

Three of the four bronchial cases had developed a wet cough overnight. He adjusted doses with medication he was running low on.

He passed Breck in a corridor. Breck looked at him. Lev kept moving.

He found Koss in operations. She looked like someone who hadn’t slept either. She didn’t mention the dock. She didn’t mention the anchor.

“Supply run. Karsten Platform. Four days each way.”

They talked logistics. Filters, medication, the circular dependency of a station maintaining itself with parts that didn’t exist for systems rebuilt past recognition. It was professional. It was also the thinnest professional exchange Lev had ever had with someone whose station he was keeping alive. Every word was measured. Every word was aware of what was underneath it.

When it was finished, she said: “Mirin wants to talk to you.”

Lev looked at her. Koss looked back. Whatever she’d decided overnight, it was in that sentence.

He headed for Mirin’s compartment.

The hatch was open. She was inside, at her console. She heard him and turned around. She was looking at him directly, and whatever Koss had told her had changed the calculation she’d been running since he walked onto this station.

“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 yesterday, which felt like a number larger than one.

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 crack in the panel seal, thirty centimeters. Patching it first because the section was draining. Going to Nika after. She’d been breathing thin air the whole time he worked. The mask, the clean air, full oxygen. Saturation at 84 and not climbing.

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

“The vasodilator?”

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

He paused. “There was something else. Her cardiac output spiked through a pathway the Veris couldn’t label. Her peripheral circulation clamped down in a vasoconstriction pattern that doesn’t match any third-gen profile I’ve seen. And her hemoglobin was binding oxygen more aggressively than the standard curve. Three systems doing things they shouldn’t know how to do, trying to compensate for the alveolar pathway that wasn’t there.”

Mirin’s pen stopped.

Mirin was writing. Not on the portable. On paper. She had a notebook. Physical pages. Ink. Paper didn’t sync to a network that might not exist next week.

“The alveolar transfer,” she said. “The enhanced pulmonary absorption. It wasn’t engaging.”

“No. Same thing I saw with the teenager. The pathway absent, not overwhelmed. Except with the teenager, you were there. You adjusted and it worked. With Nika I had your sixty percent but I didn’t have your calibration. I didn’t know which sixty percent for her.”

Mirin set the pen down.

“She said she was cold,” Lev said. “At two degrees. First time.”

Mirin looked up. The clinical significance of that landed before the human significance did, and then both of them were in her face at once.

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. Open to vacuum since yesterday.

“What did you have in there?”

“Fifteen years of tissue samples. Culture work on the pediatric modification expressions. Growth hormone assays. Bone density series.” She stopped. Started again from a different angle, the way she did when the list wasn’t saying what she meant. “I had a cryo bank with samples from every child born on this station in the last twelve years. Baseline tissue, taken at birth, taken at developmental milestones. So I could compare. So when something changed in a child’s profile I could go back to the earlier tissue and ask whether the change was developmental or whether it was drift, and if it was drift, when it started and what it correlated with. That was the work. That was fifteen years of the work. The equipment to run those comparisons, the microscopy, the culture media, the assay protocols I’d calibrated specifically for this population. I can’t run any of that from a three-by-four compartment with a diagnostic suite and a refrigerator.”

She said it without stopping this time. All of it, in one breath. Not flat. Precise. The precision of someone who’d been composing this inventory in her head since the forward ring blew and was finally saying it out loud to someone who understood what the words meant.

“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. Some start later, seven or eight instead of five. One of them, a boy, his curve flattened at four and then partially corrected at nine, and I don’t know why. I don’t know if that’s his particular genome compensating or something environmental that changed that year or just noise. 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 alveolar transfer.”

“I couldn’t test pulmonary transfer efficiency 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 alveolar pathway was fully expressed, because that requires microscopy and culture work and equipment I no longer have because it’s in a room that went to vacuum.”

She said it without bitterness, because it was a fact.

“Mirin.” He was looking at the charts. All fourteen of them, the solid lines pulling away from the dotted lines. The cardiovascular markers in the margins. The metabolic rates she’d tracked. The dosage adjustments he’d watched her make on five children in one afternoon, all trending the same direction. The thermostat in the children’s quarters set to eight degrees. A girl at two degrees who wasn’t cold. A teenager whose cardiovascular regulation pathway was absent, not failing. And Nika’s body, in a compartment with no air, improvising through systems that shouldn’t exist.

“The drift has a direction,” he said.

Mirin looked at him.

“The adults drift randomly. Every body going its own way, individual variation, the way you’d expect. But the children drift together. The metabolic rates, the cardiovascular baselines, the temperature tolerance. I watched you adjust five kids yesterday and every adjustment went the same way. Every one. And the children’s quarters are set to eight degrees because that’s where they’re comfortable. And Nika was at two degrees and she wasn’t cold, she was suffocating, because the one pathway that hadn’t caught up yet was the one she needed.”

He put his hand on the chart where the solid line diverged from the dotted line.

“This isn’t degradation. The platform is adapting. To this station. To the cold, the thin air, the low pressure. The metabolisms are running high because they’re generating heat. The cardiovascular changes are optimization, not failure. The alveolar pathway in Nika wasn’t absent. It was being replaced by something better suited, and it wasn’t finished. She was nine. She needed more time.”

The compartment was quiet. The refrigeration unit cycling. The station sounds from the corridor.

Mirin was looking at the chart under his hand. Six years of data she’d plotted herself, and she was reading it for the first time.

“I’ve been tracking this for six years,” she said. “I’ve been watching the numbers drift and adjusting for it and documenting it and worrying about it for six years. And you’re telling me it’s not drift.”

“I’m telling you the drift has a direction. You couldn’t see it because you built each profile one child at a time over fifteen years. I saw fourteen at once yesterday afternoon and the pattern was there.”

She sat with that for a while.

“This happens,” Mirin said. “To stations like this one.”

He waited.

“I hear things. Through the supply runs, through the people who pass through Karsten. Belt talk. A station near the 3:1 resonance, six or seven years ago. Third-gen children with anomalous profiles. Someone filed a report, or someone talked, or the data showed up in a network database somewhere. People came. Not military, not government. People with resources.” She said this flat. “They took the children. They took the practitioner. The station emptied out. The families scattered. Nobody did anything about it. Nobody could do anything about it.”

“One station.”

“That I’ve heard about. Maybe others. The kind of thing people talk about quietly because nobody can confirm it and nobody wants to be the one who draws attention.” She looked at the charts on the console. “Koss is afraid. That’s why the profile hasn’t been updated. That’s why the dock has a keypad. That’s why we didn’t want to call you.”

“And now you know why. What you’re seeing in the children here.”

“I can’t believe I missed it.” She was looking at the charts like she was seeing them for the first time. “If someone could study what’s happening on this station. Autonomous adaptation. The platform rewriting itself without intervention.” She stopped. “That would change everything about how modification works. Everything. And the children are the data.”

The charts were on the console between them. Fourteen children. Fourteen curves pulling in the same direction. The direction was this station, this rock, this cold thin air. The modification platform doing what it was designed to do, adapting to the environment, except nobody was controlling the process and nobody was supposed to be.

“If anyone finds out,” Lev said.

“If anyone finds out, people come again.”

The supply run. She needed equipment. Microscopy, culture media, sampling kits. Things that would let her start testing again, start understanding what the modifications were building in her children. But requesting them through the network meant data in a system, a request from a station that had been hiding for two and a half generations.

“The supply list,” he said. “Koss is sending someone to Karsten. I can add equipment.”

Mirin looked at him for a long time. “Microscopy unit. Culture media. Sampling kits. Don’t put my name on it. Don’t put the station’s name on it. Order it as consumables for the Paran.”

“I’ll add it.”

He pushed off from the console. 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 his shoulder the way she watched everything, reading it.

“When did that start?”

“A while ago.”

“Before the call?”

“Yeah.”

She looked at his shoulder and then at the charts on the console. His body. Their bodies. Modifications doing what they were going to do regardless of what anyone designed them to do.

She didn’t push it. He didn’t offer.

He left Mirin’s compartment. Koss was in the corridor. Not waiting for him. Just there. Braced against the rock wall opposite the hatch with her arms crossed and her face carrying whatever Mirin had told her and whatever she’d decided and whatever it was going to cost.

She looked at him. She didn’t ask what Mirin had shown him. She already knew.

The question in her face wasn’t what did you see. It was: was I right to let you.