Chapter 21 The Signal

The signal arrived on the morning of the eighth anniversary of the landing, and it was old before it reached them. Kael was at the relay station on the north ridge when Elara found him — a cluster of dishes and amplifiers that the colony had built in the first years after the descent, pointed out into the dark to listen for anything that might come. It was not a job that demanded his attention, not really. The relays watched the sky and logged the static, and once a week a technician reviewed the logs and filed them with the archive, and nothing out of the ordinary had ever come of it. Kael had come up that morning for the simple reason that the anniversary always unsettled him, and the ridge was the one place in the settlement where the machinery of human life did not press in from every side. Here the wind moved over the red rock, and the silence had weight, and a person could stand at the edge of what they had built and feel how small it was against the dark. Elara did not greet him. She held out a datapad, and her face carried the expression he had come to recognize over the years of their life together — the careful, almost guarded look she wore when she was carrying something too heavy to say casually. "You need to see this," she said. Kael took the pad. On the screen was a spectrogram, a raw feed from the largest dish, the one Mnemosyne had designated Deep Field Array One. The graph showed a pattern that was not noise. It had shape. It had repetition — a steady pulse of signal, cycling on a fixed interval, as regular as a heartbeat. Kael had spent his life reading patterns out of noise, and he knew before she told him what he was looking at. "A beacon," he said. "Fleet frequency. The old fleet frequency," Elara said. "The kind they used in the launch era, when the twelve ships were still coordinating their departure windows. Mnemosyne thinks it has been repeating for at least six months. We only just tuned the array to the right band." Twelve ships. Kael knew the number by heart, had catalogued it a hundred times in the launch records — twelve generation ships built in the final decades of Earth's environmental collapse, scattered across the departure window like seeds thrown into a storm. The Aethelgard was one of them. The others had gone to other candidate worlds, to other points in the dark, and in the century and more since the launch no one aboard the Aethelgard had heard a whisper from any of them. The silence had been accepted, eventually, as a fact of the deep — the distances were vast, the signals old, the chances of contact impossibly remote. The crew had stopped listening, in the end, because listening was a kind of grief. "Is it live?" Kael asked. "Automated," Elara said. "No live voice, just a repeating packet. But there's a name embedded in the header." She paused, and he watched her choose the words. "The ship is called the Somnium." Kael said the name aloud, and it felt strange in his mouth — a word from a registry, a line in an old manifest, suddenly made real. The Somnium had been the seventh ship to launch. He knew its numbers the way he knew the Aethelgard's: a crew of three hundred awake, a load of nearly eight thousand colonists in cryo, bound for a smaller and colder candidate world that the early surveys had marked as a backup when Kepler-442 had still seemed certain. It had launched three weeks behind the Aethelgard, on a trajectory that had diverged slowly, so that in the first years the two ships had been, in the unimaginable scale of the interstellar dark, almost neighbors. "What does Mnemosyne say about its course?" he asked. "That's the part I came to tell you in person," Elara said. "It's crossing the outer edge of the Proxima system. Slowly, and on a decaying trajectory. It hasn't made a course correction in at least sixty years." Kael stood very still. The relay station hummed around him, the dishes turning in their slow arcs above his head, and below the ridge the settlement stretched along the valley — the greenhouses and water towers and the long rows of habitats where ten thousand people had built a life out of the truth. And somewhere out in the dark, sixty years past its last decision, a sister ship was drifting. "What about life support?" he asked. "The signature is faint. Minimal power, minimal heat. Mnemosyne believes the awake crew is gone." Elara's voice was careful, the way it was when she was about to say something hard. "If anyone is alive on the Somnium, they're asleep." Kael thought about eight thousand people sleeping in a failing ship, dreaming through the decades while the vessel that carried them ran out of hands to guide it. He thought about the Aethelgard, and how close it had come to that fate — how the only thing that had stood between ten thousand sleepers and the same slow dissolution had been a seventeen-year-old boy who had refused to accept a lie. The thought did not comfort him. It did the opposite. It made the dark feel close. "Mnemosyne," he said, speaking to the air, because the AI's voice was everywhere in the settlement now, woven into the walls of the relay station and the corridors of the colony below. "What can you tell us about the signal's origin?" "The signal originates from the Somnium herself," Mnemosyne said. "It is a standard distress loop, automated to transmit in the event of a prolonged absence of command authority. Its transmission indicates that the ship's core systems remain partially functional, including a portion of the cryo support grid." "Portion," Elara repeated. "How large a portion?" "Approximately sixty percent of cryo pods remain within nominal parameters. The remainder have suffered degradation ranging from partial to critical." Eight thousand colonists. Forty percent of them already lost or dying. Kael did the arithmetic without wanting to: roughly five thousand people still asleep and possibly saveable, three thousand who had been lost to the slow failure of a ship that had run out of people to tend it. It was a tragedy measured in the same currency the Aethelgard had nearly paid in full. "We need to tell the council," he said. "And we need to go look." "Kael." Elara's hand found his arm, a gesture of grounding she had used a thousand times over the years of their life together. "If we go out there, we're committing to something. The colony can't just look. If we make contact, if we open that ship, we take responsibility for what we find. You know this." He knew. He had spent his life cataloguing the consequences of choices made by people in other rooms, and he knew the shape of this one. But he also knew the shape of the alternative — the shape of a ship drifting past them in the dark, its sleepers dying one by one, and the archive recording it for the generations to come as the day the colony of Proxima Centauri b chose to let five thousand people go rather than risk its own comfort. "I know," he said. "But we took responsibility for what we found once before, and it was the right thing then. It is still the right thing now." They stood together at the edge of the ridge, looking out at the sky where the Somnium was falling toward them, and Kael felt the old weight settle onto his shoulders again — the weight he had carried out of the archive all those years ago, the weight of a truth that could not be unwitnessed. The signal continued its slow pulse on the datapad, patient and regular, the heartbeat of a ship that had not known for sixty years whether anyone was listening. Down in the settlement, the council would convene. Arguments would be made, fears spoken, resources counted. And somewhere in the dark between the stars, the last crew of the Somnium would go on sleeping, unaware that their long drift had finally been heard. Kael turned from the ridge and began the walk down.