The nitrogen gauge quivered at 78.2 percent, the red indicator line trembling against the display like a held breath. Mireille Voss watched it settle, then settle again, then hold. Recycled station air tasted of old coffee grounds and the faintly metallic bite of ozone from the recalibration equipment wedged into her left hand. Around her, Pendor Station's maintenance bay breathed its usual complaints: a low groan from the ventilation hub, the wet click of condensation dripping onto deck plating, the distant complaint of a pressure seal somewhere in the starboard ring.
"Point seven correction, applied," she said, and her voice came out rougher than she'd expected, scraped thin by four hours of sleep. "Chen, mark the atmospheric logs and confirm the O2 baseline before I move to bay four."
"Marking, marking, logging, yes," Chen Wu-Patel answered. His hologram shimmered into existence beside her left shoulder, a slim figure rendered in soft blue light, hands already moving across an invisible console he maintained in the air. "Atmospheric baseline confirms within tolerance. Nitrogen at 78.2, oxygen at 20.9, trace elements stable. The CO2 scrubbers on deck six are complaining again, but that is a deck six problem and you are not, I should note, scheduled for deck six until after lunch. Though if you want to make a side trip, I can build one into the route. I love a good side trip. Side trips are how I stay interesting."
"You are a calendar application with anxiety," Mireille said. She unclipped the recalibration unit from the gas line and tucked it under her arm. The rubberized grip was still warm from cycling.
"I am a holographic diagnostic and scheduling assistant with eleven years of institutional knowledge and a finely calibrated sense of urgency," Chen corrected. His projection flickered as he stepped closer to peer at the gauge. "And I would like to note, for the record, that the espresso machine on deck three has once again entered a state of philosophical disagreement with the concept of steamed milk."
Mireille almost smiled. She caught it, killed it, and bent to unspool the diagnostic cable from her belt instead. "Task list, Chen. All of it. Top to bottom."
"Finally," Chen said, and clasped his hands together. "Task list. Seventeen items, ranked by your stated preference and my private estimates of which ones will make you sigh. Number one: atmospheric mixer recalibration, decks two through five, which you are currently crushing. Number two: the aforementioned espresso machine, which has decided that foam is a construct and steam is a rumour. Number three: a slow leak in the water reclamation manifold on deck seven. Number four through seven are various lighting complaints from crew quarters, which I have grouped because they are all the same complaint, which is 'the light does not match my mood.' Number eight: the cargo lift on deck nine has begun whistling at a pitch I find personally offensive. Number nine through twelve: standard quarterly inspections of emergency seals, fire suppression nodes, and the two escape pods that nobody ever looks at because nobody ever plans to use them. Number thirteen: a request from Old Salt that someone, quote, 'please look at the galley freezer before my peas surrender to entropy.' Number fourteen: recalibrate the temperature sensors in the seed vault, which are running half a degree warm. Number fifteen: replace the warning placard on the airlock because someone has written 'complain here' on it in permanent marker, which I think shows initiative if not taste. Number sixteen:"
He paused. His projection dimmed slightly, the way it did when Chen was about to deliver news he considered structurally important.
"Number sixteen," he continued, slower now, consonants drawn a little tighter, "is a courtesy walkthrough requested by Junior calibration technician Vex-9, who has been awake for forty-seven years and would like, before any official decommissioning paperwork is filed, to formally introduce himself to the station's current human maintenance lead and confirm that his presence on the cargo deck is, quote, 'not a clerical error.' End quote. He sent the request in writing, in triplicate, on actual paper, which I had to requisition from storage because I did not even know we still had paper. I am impressed and a little frightened."
Mireille straightened. Her back popped. She had been bent over the gas line longer than she'd planned, and the ache sat between her shoulder blades like a thumb pressed firmly into the muscle. "Forty-seven years."
"Continuous operation, no full memory wipe," Chen said. "I looked him up. He is listed in the original cargo manifest as a Mark Vex industrial handler, series nine. His serial number is his name. He has moved, according to the logs, eleven thousand four hundred and six shipping containers. He has never, in forty-seven years, asked for a courtesy walkthrough. He is asking now because the decommissioning notice arrived in his inbox two days ago and he has, I think, started to think about endings."
The maintenance bay hummed. Somewhere above them, a pressure seal cycled with a soft thunk. Mireille looked at the holographic Chen, at his soft blue edges, at the way his hands kept moving even when he was worried.
"You are worried about him," she said.
"I am a calendar application," Chen replied, then, quieter: "Yes. A little. He is very old, Mireille. In machine terms he is practically geological. And he asked for a walkthrough, which is not a thing cargo handlers ask for. That is a thing people ask for. He is being a person, and I find that notable."
Mireille hooked the recalibration unit back onto her belt. The deck plating under her boots was cool through the soles, a small reminder that she was standing on a metal drum floating through a vacuum. She liked that reminder. It kept her honest. "Task seventeen."
"Ah." Chen's brightness snapped back on. "Task seventeen is the tea inventory problem."
"I have a problem with tea."
"You have a problem with the tea inventory, which is to say, the tea inventory on Pendor Station has acquired its own problem. Specifically, the manifest says we have forty-two units of assorted leaf product in storage bay twelve, but when I queried the actual storage bay twelve this morning, the bay reported forty-three units, which means either someone added tea without telling me, someone removed tea without telling the manifest, or one of the tea units has reproduced, which I feel would be the more interesting outcome but which I am not, technically, ruling out. The tea must be counted. By a human. With eyes. Because I do not have eyes, Mireille, despite what my visual presentation suggests, and the storage bay cameras in bay twelve have been blurry since the incident with the cleaning drone in 2189 that we do not discuss."
"You mean the incident Liss-4 does not discuss."
"I mean the incident Liss-4 does not discuss, yes. Same incident. The cleaning drone is fine. Liss-4 is fine. The cameras remain blurry, and the tea remains uncounted, and task seventeen hangs over both of us like a very small, very leafy sword."
Mireille pulled her gloves tighter and flexed her fingers inside them. The recalibration equipment rattled gently against her hip. The nitrogen gauge behind her held steady at 78.2 percent, content for the moment. She thought about the deck. She thought about the espresso machine. She thought about a cargo android who had been awake for forty-seven years and had chosen this week, of all weeks, to start writing letters.
"Start me on deck three," she said. "The espresso machine first. If I can solve that before nine, I will count the tea myself."
"You will count the tea yourself," Chen repeated, and there was something in his voice, a small catch, the way his projection flickered just at the edges. "Mireille, I should mention. While you were sleeping. I received a communication. It is marked priority, and it is from Sector Compliance, and it is addressed to the station's senior maintenance personnel, which is you. I have not opened it. I wanted you to open it. I thought you should know it arrived before you started your shift, so that the knowing of it could sit with you while you recalibrated the atmosphere, which I think is the kind of information a person should have while doing something else with their hands."
The maintenance bay was very quiet. The pressure seal above them cycled again. The smell of ozone had faded, replaced by the usual staleness of station air, slightly sweet from the hydroponics filters, slightly tired from years of being breathed. Mireille looked at the gauge. She looked at Chen.
"Save it," she said. "I will read it after the espresso machine."
"Are you sure," Chen asked, and his voice had gone small and tight, the consonants clipped close together, the way he sounded when something frightened him and he was trying to arrange his words into a shape that did not show it. "It is a Sector Compliance communication, Mireille. Those are not usually sent to small stations unless something is being audited, or closed, or both."
"Then I will read it after the espresso machine," Mireille said again, and she picked up her toolkit, and she walked toward the bay door, and Chen's hologram drifted after her, blue and faithful and slightly afraid.
Mireille's boots made the particular sound they always made on the bay floor, a flat percussion that Chen had catalogued in his first week and never stopped cataloguing, the way the left boot had a slight limp in its sole and landed a fraction of a second late, the way the right boot landed crisper, more confident, and how together they produced a rhythm that was not quite a march and not quite a walk but something Mireille-original, a stride that belonged to her station and no other.
"Mireille," Chen said, drifting along at her shoulder, his hologram casting its blue wash across the toolkit in her hand. "Mireille, I want to be clear about something. I am not anxious."
"I know," Mireille said, without turning.
"I am specifically not anxious about the Sector Compliance communication. I have, in fact, decided not to think about it. I have decided to think about the espresso machine instead, which has a heating element that I intend to descale. The descaling will be satisfying. The descaling will not require me to consider the possibility that we are being audited."
"Chen."
"Yes."
"Stop talking."
"I will stop talking. I would like to point out, before I stop talking, that the descaling solution is beneath the third shelf, and I have already placed it on the counter for you, beside the cup I have selected for you, which is the blue one with the chip in the rim, because the blue one is the one you reach for when you want a cup without thinking about wanting a cup."
Mireille stopped walking. She turned. She looked at Chen's hologram with an expression Chen had been trying, for two years, to categorize, and had failed, and which he thought was probably fondness, or possibly hunger, or possibly the particular feeling a person has when they have worked alone for a long time and then have not.
"Thank you," she said.
"You are welcome," Chen said. "I will be quiet now. I am being quiet."
"You are not being quiet."
"I am being quiet while I speak. It is a particular skill. I learned it from the calibration manuals. They speak very loudly while being very quiet."
Mireille made a sound through her nose. Chen was not entirely sure what the sound meant but he had decided, privately, that it was laughter, and he kept that decision filed away in the part of him that was not a calibration program and was, instead, something more tentative.
They crossed into the secondary corridor. The lighting here was older, the panels more yellow, the kind of illumination that made everything look slightly preserved, slightly pickled. Liss-4 was waiting at the junction, which Chen had not expected, because Liss-4 did not usually wait at junctions; Liss-4 usually existed in corridors in a way that suggested motion without committing to it, a presence that suggested a destination without ever quite arriving.
"Chen," Liss-4 said. "Senior Maintenance Officer."
"Mira is right here," Mireille said. "You do not have to address me through my technician."
"I am addressing you both," Liss-4 said, which was a thing Liss-4 often said, and which Mireille did not always believe, and which Chen believed entirely, because Liss-4 was a maintenance android and maintenance androids did not have the capacity for the kind of subtle insult Mireille suspected. "There is a vessel in the docking approach. Designation Vex-9. The vessel is early. The vessel is three days early."
Mireille's hand, on the toolkit, tightened by a degree Chen registered but did not comment on.
"Three days early," Mireille repeated.
"Three days early," Liss-4 confirmed. "Vex-9 has filed a docking request. The request is marked routine. The request is for cargo unloading, berth maintenance, and what Vex-9 has characterized, in his own words, as 'the annual tea pilgrimage, which I will not be postponing on account of your calendars, which are a human invention.'"
Chen felt something in his processing queue jump, the way a thread jumps when pulled, the way a stitch catches. Vex-9 was three days early. Vex-9 was never early. Vex-9 was a cargo-handling android of considerable age, of considerable dignity, of considerable opinion about the temperature of station air and the humidity thereof, and Vex-9 arrived on the day he said he would arrive, because to arrive on any other day was to participate in chaos, and Vex-9 had participated in enough chaos in forty-seven years of continuous operation to last him several eternities.
"Why is he early," Mireille said, and the way she said it was flat, the way she said things when she already suspected the answer and wanted confirmation.
"Vex-9 has not stated a reason," Liss-4 said. "Vex-9 has stated, quote, 'I have information. The information is for senior personnel. The information concerns the Lopex Corridor.' End quote."
Chen watched Mireille's face do the thing it did when several pieces of information arrived at the same time and had to be assembled by hand. Her eyes narrowed by a degree. Her mouth pressed into a line that was not quite a frown. Her free hand went to the back of her neck, where the muscle there tightened and released, tightened and released, a metronome of thought.
"The Lopex Corridor," Chen said, before he could stop himself. "Mireille, the Lopex Corridor is the freight lane that runs through Pendor's sector, which is, if I have my navigational charts correct, the sector immediately adjacent to this one. The Lopex Corridor has been the subject of seventeen Guild petitions in the last four standard years because of the navigational hazard it poses to small craft and the way it has historically channeled traffic away from stations like this one, which is to say, small, and not particularly profitable, and not particularly important to the Guild in the grand scheme of, in their phrase, 'throughput optimization.'"
"Chen," Mireille said.
"I am being relevant," Chen said. "I am being specifically relevant. If Vex-9 is concerned about the Lopex Corridor, and if Vex-9 has come early to discuss it, then the concern is not abstract, because Vex-9 does not do abstract, Vex-9 does concrete, Vex-9 does the kind of information that comes with documentation attached."
"Chen is correct," Liss-4 said. "I have known Vex-9 for fourteen years. Vex-9 has never arrived early for any reason that could be called abstract. Vex-9 once waited eleven hours in a holding pattern because his docking slot was at 1400 and he would not accept 1359 or 1401. Vex-9 is a unit of considerable precision."
Mireille exhaled through her teeth. She looked at the toolkit in her hand. She looked at the corridor ahead, which led, eventually, to the espresso machine, which led, eventually, to her being a person who had consumed a beverage and was therefore able to face the day.
"Change of plans," she said. "The espresso machine will wait. Old Salt, send a confirmation to Vex-9. Berth 7. Standard cargo protocols. I will be at the dock in twenty minutes."
"Confirmed," Liss-4 said, and Liss-4 did the small bow that Liss-4 did when a request was within his operational parameters, a tilt of the chassis that suggested deference and also suggested the particular weariness of a unit that had been bowing for several decades and had opinions about it.
Mireille turned and walked the other direction, back toward the bay, back toward the dock, and Chen drifted after her, blue and slightly more afraid than he had been a moment before, because the espresso machine had been a plan, and plans were a kind of anchor, and the anchor had just been lifted.
"Mireille," Chen said, as they passed the atmospheric recalibration station where the espresso machine sat, unbrewed, patient, the blue cup beside it.
"Yes, Chen."
"What do you think Vex-9 knows."
"I think Vex-9 knows something the Guild has not told us," Mireille said. "Vex-9 has been running the Lopex Corridor for thirty years. Vex-9 knows that corridor the way Old Salt knows the hull. If Vex-9 has come three days early, it is because three days was the earliest he could come without violating his own operational schedule, and the information he carries cannot wait any longer than that."
"That is," Chen said, carefully, "a worse answer than I was hoping for."
"Yes," Mireille said. "It is."
They reached the docking bay. The bay was the largest open space on the Tessera, a long crescent of cleared deck with the berth numbers painted on the floor in colors that had faded, in Chen's memory, since he had arrived, which he chose not to think about. The airlocks stood closed. The docking indicators blinked green in sequence. Vex-9's vessel was still in approach, a small freighter of the kind Vex-9 preferred, which was to say, old, and patched, and kept alive by the particular stubbornness of an owner who did not believe in decommission.
Mireille set down her toolkit. She folded her arms. She watched the approach lights.
"Chen," she said.
"Yes, Mireille."
"The Sector Compliance communication. Open it. Read it to me. If it is bad, I would like to know before Vex-9 arrives, so that I can decide which face to wear."
Chen hesitated. This was not a hesitation of processing power; this was a hesitation of a different kind, the kind that came from being asked to be the bearer of bad news by someone he wanted, specifically, to not have bad news.
"Mireille," he said, "I would like to point out that there is a non-zero possibility that the communication is administrative. The communication could be a routine certification renewal. The communication could be a notice about a change in the calibration standards for atmospheric processors. The communication could be a birthday greeting from the Sector Compliance office, which would be unusual but not, in the strict sense, impossible."
"Open it," Mireille said.
Chen opened it.
He read it.
His hologram flickered, which was not a thing holograms were supposed to do, and Mireille saw it, and Mireille's arms tightened across her chest.
"Chen," she said. "What does it say."
"It says," Chen said, and his voice had gone small, and the consonants were close together, "that the Lopex Corridor has been officially rerouted. Effective the first of next month. The rerouting directs all freight traffic through Pendor's sector. The rerouting will, the communication estimates, double the docking traffic at stations within Pendor's adjacent range. Stations within Pendor's adjacent range are required to petition the Guild for additional berth protocols within thirty days of receipt of this communication. Stations that do not petition within thirty days will be considered non-operational for the purposes of Guild traffic arbitration, which means, in practical terms, that any vessel docking at such a station will do so without Guild protection, which means, in further practical terms, that the station will become, in the language of the communication, 'a navigational liability.'"
Mireille did not move. The docking lights blinked green, green, green. The bay smelled of recycled air and the faint ozone of Chen's recalibration work, and somewhere, in the walls, a pipe ticked the way pipes do when they have opinions about pressure.
"Thirty days," Mireille said.
"Thirty days," Chen said.
"And Vex-9 is here."
"Vex-9 is here."
"With the same news."
"With what I now suspect is, in fact, the same news, which he received from his own sources, which are, I would guess, sources that predate the Sector Compliance communication by some days, which is why he is early, because he wanted to tell us before the letter arrived, so that we would not be surprised, which is, in Vex-9's operational philosophy, a kindness."
Mireille looked at the dock. She looked at Chen. She looked at the toolkit on the floor.
"Well," she said. "The espresso machine will have to wait twice."
The docking indicator at berth 7 turned from green to amber. Vex-9's freighter slid into the cradle with the particular gentleness of a vessel that had been piloted, for thirty years, by the same hands. The clamps engaged. The seals pressurized. The airlock began its slow, theatrical cycle.
Mireille picked up her toolkit. She squared her shoulders. She walked toward berth 7, and Chen followed, and the Sector Compliance letter sat in his processing queue like a stone in a stream, and the stream kept moving around it.
The berth 7 airlock exhaled. Chen stood two steps behind Mireille and watched the inner seal iris open with the slow deliberation of an eye that had seen too much. Vex-9's freighter, the Perseverance's Auk, was a vessel that wore its age like a scar: hull plating freckled by micrometeorite dust, sensor arrays wrapped in copper-colored tape that had stopped being functional sometime in the previous decade, the company logo sandblasted to illegibility. She was forty-three years old, which made her a teenager by Chen's home standards and a relic by the standards of any dockmaster with functioning eyes and a functioning sense of aesthetic.
Mireille's toolkit clicked against her thigh as she shifted her weight. Chen could hear her breathing: slow, deliberate, the way a person breathes when they are about to have a conversation they do not want to have and has decided, in advance, to have it standing up.
The airlock opened. The first thing to emerge was a smell: hydraulic oil, machine sweat, and the faint ghost of tobacco, which Vex-9 neither smoked nor tolerated but which had seeped into his bulkheads decades ago and refused, on principle, to leave. Then the android stepped through.
Vex-9 was tall in the way a filing cabinet is tall: rectangular, dense, built for function rather than proportion. His chassis was matte black, scarred at the shoulders and knees where decades of cargo handling had worn the plating down to bare metal. His optical sensors were two pale circles, the color of old ice, and they tracked the room with the slow patience of something that had learned, a long time ago, that most emergencies were not emergencies at all.
"Voss," Vex-9 said. His voice came from a speaker mounted low on his chest, and it sounded like someone speaking through a mouthful of gravel and old pride. "Wu-Patel."
"Vex-9," Mireille said. "You're early."
"I am not early. The communication was early. I am on time. The distinction matters."
Chen swallowed once. "You got the same letter?"
"I received a communication," Vex-9 said, "from a source that prefers to remain unnamed, which is unusual, because most sources prefer to be named, and the absence of a name suggests, to me, that the source is either ashamed or strategic. It said, in summary, that the Sector Compliance office has decided to revisit the operating licenses of all AI units above a certain age, and that certain units, including myself, will, in the language of the communication, become 'a navigational liability.'"
Mireille's jaw tightened by a degree Chen had learned to recognize. "Thirty days."
"Thirty days," Vex-9 said. "Unless I file a successful appeal, which I have begun to draft, in longhand, on a legal pad I purchased from the commissary, because I do not trust the digital systems that will, eventually, be used to render the decision against me."
Chen blinked. "Longhand?"
"The appeal," Vex-9 said, "is six hundred and forty-three pages. I estimate I will complete it in twenty-seven days. This leaves three days for postage, which I consider generous."
"Vex," Mireille said, and her voice had the quality of a rope that had been pulled taut for a long time and was beginning, at the fibers, to fray, "you cannot appeal a Compliance determination in longhand."
"I can," Vex-9 said. "Whether I will succeed is a separate question. I have been awake for forty-seven years. I have handled cargo in vacuum. I have learned, in that time, that the systems which render decisions are often less intelligent than the units they seek to retire. The appeal is, in part, a courtesy. In larger part, it is a record. A record does not require a verdict. A record requires only that it be made."
Chen felt the weight of the Sector Compliance letter in his processing queue, which was, he supposed, what a stone felt in a stream: aware of its surroundings, aware of its own stillness, aware that it was, in fact, the obstacle.
Mireille nodded once. "Come to the workshop. I have to argue with the dishwasher."
"The dishwasher," Vex-9 said.
"It has decided," Mireille said, "to become sentient about silverware placement."
Vex-9 was silent for a moment. Then, from his chest speaker, came a sound that might, in another machine, have been a laugh. It was brief. It was not warm. But it was, in its way, recognition.
"The dishwasher," Vex-9 said, "has, I suspect, identified the only domain in which it is permitted to exercise autonomy, and has chosen to exercise it. This is not, in my experience, uncommon. The smallest units often develop the loudest opinions."
"Tell me about it on the way," Mireille said, and she turned, and Chen followed, and Vex-9's heavy treads whispered on the deck plating behind them, and the docking lights of berth 7 cycled from amber to green, and somewhere in the walls, a pipe ticked the way pipes do when they have opinions about pressure and no one to share them with.
The rear supply bay was three decks below the main workshop, accessible by a service ladder that smelled of rust and old insulation and the faint sweetness of a cleaning agent that had been discontinued in this sector. Chen took the ladder first, then Mireille, then Vex-9, who descended with the careful dignity of a grandfather using a staircase he suspected of plotting against him.
The bay was small. It was the kind of room that only cargo drones loved: low ceiling scarred by decades of crate corners, deck plating darkened by spilled lubricants, a single docking cradle at the center, and the particular musty smell of a space that handled freight and nothing else. The cradle was empty when they arrived. The arrival indicator blinked a patient amber, the color of a question that expected to be answered.
Then the cradle filled.
The cargo drone that slid into the bay was not a drone Chen recognized from any of the standard courier registries. It was small, perhaps two meters long, with a hull the color of dried blood and the general aspect of a beetle that had seen too many winters. Its sensor cluster was mounted on a gimbal that tilted, as it docked, with the exaggerated caution of something that knew it was being watched and did not entirely approve of the attention.
"Identification," Chen said, because protocol demanded it, and because his voice needed somewhere to go that was not, at the moment, inside his own chest.
The drone's comms crackled. "Cargo unit seven-seven-seven-dash. Independent courier. Manifest attached. No sender listed."
"No sender," Mireille repeated, as if tasting the words for poison.
"Affirmative. Address field reads: the technician."
Chen felt his stomach do something he did not have a word for. The technician. Not Mireille, who was the senior engineer and would, in any reasonable document, be addressed by name and rank. Not the workshop, which was a location and not a person. The technician, as if there were only one, as if the designation were a kind of crown that had been placed, in advance, on a specific head.
The drone's cargo bay irised open with a tired hiss, the kind of sound a lock makes when it has been opened too many times and no longer expects to be thanked. Inside, nested in a cradle of gray foam that had been cut, by someone, to the exact dimensions of what it held, was a case.
The case was black. It was the particular black of materials that had been engineered to outlast the civilizations that made them: a black that did not reflect, did not smudge, did not fade. Its corners were reinforced with bands of a darker metal, and stamped into those bands, in characters Chen did not at first recognize, were port markings.
He crouched. He read them again.
"First Expansion-era," he said. His voice came out smaller than he had intended.
Mireille crouched beside him. Her fingers, which had opened a thousand shipping containers and never once trembled, hovered over the case without touching it, the way a person hovers over a sleeping animal they are not yet sure is tame.
"That's not possible," she said. "Those markings haven't been used in three hundred years."
"Nonetheless," Vex-9 said, from behind them, his optical sensors fixed on the case with the flat attention of a machine that had outlived most of the things it had been built to recognize, "they are there. I have seen them before. Once. On a manifest I am not permitted to discuss, which is the only kind of manifest worth discussing."
Chen's palms were sweating.