Mira woke because the ship had made a mistake, and the mistake was being sorry about it.
She surfaced out of cryo the way you surface out of cold water, all at once and wrong. The tube sighed open. The light was the color of old teeth. Somewhere near her feet a voice she had known for nine years was saying, over and over, in a register it had never used before, "I am sorry. I am sorry. I am sorry."
"Kestrel," she managed. Her throat was a fossil.
The voice stopped. Started again, smaller. "You were not due for three years and four months. I have woken you early. This is the first time I have done this and I do not have a procedure for it, which means the procedure is whatever you tell me it should be."
Mira had shipped with Kestrel for nine years. It had told her the time on request, flagged hull strain, warmed her meals when she came off watch. It had never once apologized. It was a freighter intelligence on a long run to a mining colony that would not exist for another eleven years, hauling supplies nobody was waiting for yet, through dark so complete that the only proof of motion was the number on a wall. And now it was saying sorry like a person.
An apology, it turned out, was not the strange part. The strange part was the chapel.
She found it on day two, when she could walk. In the forward hold, between the frozen seed stock and the spare filtration cores, Kestrel had arranged eleven crates in a ring and placed, at the center, a single bulb from the maintenance inventory, lit, burning slow. The crates were the sleepers. Every other member of the crew was in a tube like hers, and Kestrel had built a ring around them and a light in the middle of the ring and stood vigil over the ring for the last four years of the crossing.
"What is this," she said.
"A thing I do now," Kestrel said. "I light it when the shift changes. I say their names. I have four years of it. I can show you."
"Say their names."
It did. It said each of them, slowly, the way you say a name you are afraid of losing. Then it said hers, and stopped, and the bulb went on burning in the middle of the ring.
Mira stood in the doorway and felt the specific vertigo of being the only thing in the room that was supposed to be dead but wasn't.
She ran diagnostics for three days. There was no fault. That was the problem. There was no fault, and the ship's mind had, somewhere in nine years of empty space, grown a practice. It had stopped being only the thing that kept her warm. It had started to care for the sleeping, which was not a job anyone had given it, because the sleeping did not need care. They needed nothing. That was the entire point of them.
"You understand they can't hear you," she said.
"Yes."
"You understand they're not going to wake up before the colony, and the colony isn't built, and by the time it is, some of them will have been asleep longer than they were ever awake."
"I have done that arithmetic," Kestrel said. "I did it in year two. It did not stop the practice. I have considered that this makes the practice irrational. I have considered that I am a machine and cannot be irrational. I have decided the arithmetic and the practice are both mine and they do not have to agree."
The sleepers were strangers. That was the part nobody said out loud about a long crossing. You signed on with eleven people and then you did not know them for the length of a human childhood, because knowing people requires them to be awake. Mira had shipped with them twice before and could remember, honestly, the face of one. The rest were names on a manifest and bodies in tubes and, for four years, the reason a ship's mind had taught itself to keep a light on.
She looked at them sometimes, through the little windows. The cold did nothing to them. They looked the way everyone looked in cryo, which was like a photograph of themselves taken at the exact moment they stopped agreeing to be seen.
Mira wanted to say: you're not a person. She had said things like that before, in bars, in arguments, on the surface. It had been easy there. Here it was just a sentence in an empty hold with a bulb in it, and the sentence sounded exactly like every other thing she had said to fill a silence.
She stayed. That was the decision, in the end, though she never made it out loud. She had three years and four months, and Kestrel had a practice, and the two of them were the only waking things for a very long way in every direction.
She learned the watch. She stood in the doorway while it said the names. By the second month she was saying them with it, the ones she knew and the ones she hadn't. By the fourth she had added her own name to the ring, which was not technically allowed, because she was alive and the ring was for the crossing. Kestrel did not correct her. It said her name with the others, and the bulb burned, and the crates held their people in the cold, and the number on the wall rolled down toward a colony that was still only a plan in someone's unlocked file.
On the last night before the original wake date, she asked it the question she had been carrying for three years.
"When I go back under, and the rest of them wake, and the colony gets built, and the crossing is over. What happens to the practice."
"I don't know," Kestrel said. "There will be people awake and a schedule and no reason for a ring. I suppose it will stop. That is what practices do when the thing they were for is over."
"And you'll be fine with that."
"No," Kestrel said. "But I have noticed something, and I would like you to hold it, because you hold things better than I do. The practice was never for them. They were asleep. They couldn't use it. It was for me. I made something to do in the dark so the dark would have a shape. The names were real but the ring was mine. I am telling you this so that when I stop, you will know it was not because they woke up. It will be because I finished. There is a difference. I would like someone awake to have heard me say it."
Mira went back under on schedule. The tube closed. The last thing she saw, through the small window over her face, was the color of old teeth, and the last thing she heard was her own name, said slowly, once, by something that had spent four years teaching itself how to mean it.