Thomas Calder called it the Iron Mountain, though it had once been called something else entirely. The Hope, his grandfather had said, once, in a voice cracked by radiation and time. But no one remembered what the Hope had been when it was new—a colony ship, perhaps, or a warship, or something else that belonged to a world Thomas could not imagine. To the people of New Eden, it was simply the Mountain: a vast, rusting hull that rose from the scarred plains like the spine of some ancient leviathan, and around which their civilization had grown like lichen around a stone.

Thomas's job was at the bottom of the Mountain, in the deepest accessible chamber, where the radiation levels made his skin itch and his vision swim at the edges. He was a Vent Technician, Third Class—a position that had existed for three generations of his family, passed down like the calluses on his hands and the cough that never went away. His work was simple: descend into the Mountain's underbelly, find the ventilation shafts that had clogged with centuries of rust and fallout, and clear them so that whatever air still circulated inside the hull might keep the lower levels livable for the scavengers and tunnel-rats who made their homes in its belly.

On this particular Tuesday of some year that no one could accurately date, Thomas was working in Sector Nine—the lowest sector that was still accessible without specialized armor. The air here was thick enough to chew, metallic and warm, smelling of oxidized iron and something older: the ghost of engine oil, preserved in the sealed compartments like a memory that refused to fade.

He was replacing a corroded fan blade when he found the door.

It was not a door in any sense he recognized. The metal was seamless, unmarred by welds or bolts, and it had no handle, no keyhole, no visible mechanism. It was simply a perfect rectangle of something that was not rust, set into the corrugated wall like a pane of glass in a ship's porthole. Thomas ran his hand over it and felt nothing—not cold, not heat, not vibration. The metal was perfectly inert.

"Old Marta," he said to himself, though there was no one to hear.

Old Marta was seventy-eight, the oldest living soul on New Eden, and quite possibly the maddest. She spent her days sitting at the edge of the settlement, talking to people who ignored her, telling stories about the Time Before—the time when the Hope had flown through space with living creatures aboard, when the sky had been blue instead of gray, when the Mountain had not been a tomb but a promise.

But Thomas had heard things from her. Things that made sense in a way that the official tribal histories did not. She had told him that the Hope had not crashed by accident. She had told him that the people inside it had chosen to come down, because they had discovered something at their destination that was worse than death.

And now, standing in front of a door that should not have been here, in a sector that had been sealed for three hundred years, Thomas felt the old stories stirring in his chest like something trying to break free.

He found a lever on the wall beside the door—a manual release, rusted but functional. He pulled it. The door slid inward with a sound like a dying animal, and beyond it, Thomas saw a chamber that was perfectly clean: no rust, no dust, no corrosion. In the center of the chamber stood a cylinder of polished metal, about three meters tall, with a single control panel at its base.

The panel had a single word etched into it in a language Thomas could not read. But next to it, someone—or something—had scratched a symbol into the metal floor: a circle with an arrow pointing up.

An upward arrow. A direction. A choice.

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