The gate closed.

  She watched it happen. The light. Then the absence of light. Then the gate standing sealed and empty in the bay, the way all the other gates had stood sealed and empty after their person went through, except that she had watched nine thousand eight hundred and ninety-nine of those closures without feeling them and this one she felt in every part of herself that she had spent ten years learning not to feel things in.

  He was gone.

  The ship was coming apart around her. She could feel it in the structure of the terminal she was standing at — a vibration that had changed quality in the last ninety seconds from the manageable tremor of something under stress to the specific wrongness of something that had passed the point of stress into the point of failure. The alarms that had been multiplying since the first tremor were still multiplying. Somewhere in the upper sections something had given way entirely. The void was showing through a section of the far wall.

  She looked at her terminal.

  The screen still showed his transfer record. Survivor 9,900. Destination confirmed. She had confirmed it herself, at this terminal, at the exact moment his gate locked — the modification she had spent ten years positioning herself to make. Cultivation world changed to mortal world. Category 1 changed to Category 0. She had done it cleanly, in the half-second between the destination field opening for final confirmation and the gate mechanism sealing. No one had seen it. No one had been watching her screen. Everyone had been watching the gates, watching the queue, watching the countdown.

  No one had known to watch her.

  Around her, the remaining scientists — ninety-eight of them now, the other hundred minus herself and Zhao, who was still at his terminal on the far side of the bay — were doing what scientists do when a system fails catastrophically and there are no solutions left: they were working. Checking readings. Calling numbers. The particular controlled motion of people who understood that the work was no longer useful and were doing it anyway because stopping was not something they knew how to do. She understood this completely. She had been doing it herself for ten years.

  She looked at the sealed gate.

  Survivor 9,900.

  She had watched him stand in that queue for fourteen hours. Had watched him stand at his mark with the specific stillness of someone who had, at some point in a life he could not access, learned that waiting was not the same as doing nothing. Had watched him notice the stations. Map them. Build a picture of the system from its components without deciding to, the way he always built pictures of things, the way he had always been unable to stop himself from understanding how things worked.

  She had watched him notice her.

  Not dramatically. Not with recognition — she had not expected recognition and had not received it, and the not-receiving of it was something she had prepared for across ten years and something that had still, each time his gaze had moved across the bay, arrived in her like a weight she had underestimated. He had looked at her the way he looked at everything: with the patient, angular attention of someone collecting information he did not yet have a category for. He had filed her. She was data. She was an unexplained pattern in the behaviour of a scientist at station three-from-right.

  She had been his entire world once.

  Another tremor. Harder than the last. The terminal flickered and she steadied herself against it and looked around the bay at the people she had worked beside for ten years — the ones who had known her as Lin Yan, competent and quiet, the scientist who arrived early and left late and never talked about her life before the program. None of them knew what she had done at the moment of transfer 9,900. None of them knew why she had stayed. None of them knew what she was, or what he was, or what any of this was actually for.

  She had not told them. She had not told anyone. She had spent ten years not telling anyone anything that would have made her useful to them as more than a pair of hands that showed up and did the work.

  By 2021 the walls had been so thoroughly built that she had stopped being able to feel them as walls. She had thought that was management. She understood now, watching the bay come apart, that it was just loss of a different kind.

  The void through the far wall had grown.

  She looked at her Nexus Seal.

  It pulsed on her wrist — the same faint steady luminescence as all the others, standard ark-issue to any observer, which was what it had been designed to appear to be. She had worn it for less than a day. In ten years of preparation she had thought about every detail of his path through eleven tiers and she had not once thought about what happened to her after she touched this. There had not seemed to be a point. The point had been him. The point had always been him.

  She looked at the gate.

  Sealed. Empty. The light that had taken him already gone.

  She thought about the moment in the corridor, before the machine. She had told him she was afraid. He had said then hold on and held out his hand and she had taken it and the corridor had torn them apart before she could do anything with the fact of his hand in hers except hold it, and then it was gone, and then there was 2016, and nothing, and ten years of building a self from whatever she could find in a city that didn’t know her name.

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  She had held on. The way he had told her to.

  She touched the Nexus Seal.

  Not with a destination. Not with a plan. She pressed her fingers against it the way she had pressed her fingers against everything in the last ten years — with the precise, contained force of someone who has decided that whatever happens next is acceptable, because the alternative is to stand in a bay that is coming apart and watch the void fill the space where the wall used to be, and she had been watching things fall apart for long enough.

  The world went white.

  Not the white of the gate light. Not the white of the void. Something else. The specific luminescence of a device that has just read a soul it did not expect and has decided, on the basis of that reading, where to send it.

  Then the white resolved into something.

  She was standing on ground.

  Real ground. Not ship floor, not corridor tile, not the bare concrete of a loading bay. Ground that had been ground for a long time — packed and worn and old in the way things are old when generations of feet have crossed them in the same direction. The air was different. Not the recycled functional air of the ark. Air that had been outside, that carried the particular complexity of a world that had been alive for a long time without anyone engineering the smell out of it.

  She stood still and breathed it.

  Then she felt it.

  Not with her eyes — her eyes were adjusting, finding the low light of what appeared to be early morning in a place that had not yet decided to be fully daylight. Not with any sense she had a precise word for. Something older than that, something that her future scientific mind registered as data and could not immediately categorise as any known type of data. The world had weight to it. A specific weight, the kind that comes not from size or density but from significance — the feeling of a place that has been shaped by something, pressed into a particular form by a force that had since departed and left the impression behind.

  Someone had been here.

  Not recently. Not in the way that recent meant hours or days. In the way that recent meant compared to the age of a world — the impression was fresh against the bedrock of the place, the way a handprint is fresh in drying clay. Something had moved through this world and changed it at a level she could feel through the ground.

  Something had built here. Had climbed here. Had left the particular residue of a person who had started with nothing and made something that outlasted them — not a building, not a monument, but a shape in the world’s memory of itself. A civilization that had been organised around a single point and still bore the topology of that organisation even now, even after the point had gone.

  She looked at the ground. At the worn path beneath her feet, pressed deep in the way paths are pressed deep when they have been used for a long time by people who knew exactly where they were going.

  She looked at the horizon. At the sky that was lightening toward morning over structures that were old enough to be part of the landscape.

  She looked at her Nexus Seal. Still pulsing. Steady.

  He had been here. She did not know how she knew this with such certainty. She had no evidence beyond the feeling of it, and she was not a person who operated on feelings beyond evidence. But the feeling was not a feeling. It was a reading. Her mind, which had been trained across two lifetimes to analyse and understand and find the logic underneath things, was doing its work, and its work was telling her: the shape of this world matches a specific source. The impression in this clay is a specific hand.

  She did not know his name here. She did not know what he had called himself, or what he had built, or how long ago he had left. She did not know which world he was in now, or whether he was well, or whether the first tier had been as hard as she had calculated it would be.

  She knew none of it.

  She stood in the impression he had left in a world he had already departed and she breathed the air of the place and she let herself, for one moment only, not be Lin Yan, not be the scientist who arrived early and left late, not be the person who had spent ten years learning to feel nothing she could not afford to feel.

  She let herself be someone who had just found the first footprint.

  Then she straightened. The motion came from the same place all decisions came from — the part of her that had decided, ten years ago in a city that did not know her name, that the alternative to continuing was not acceptable. She looked at the horizon. At the direction the worn path led.

  She did not know what that meant yet.

  She would spend a long time finding out.

  End of Chapter 9

  End of Arc 0