Sci-fi · story
The Unlisted Door
Prompt: A maintenance robot on a generation ship finds a door that isn't on any blueprint.
Ines Okafor had walked the spine corridor of the *Halcyon Reach* for eleven years, and in all that time its walls had never surprised her. Seventy-two hundred people lived inside its curved steel, and every panel, pipe and hatch was logged in the ship's master registry. So when her maintenance drone, Pell, stopped at the end of Corridor Nine and chirped a sharp two-note warning, she assumed a coolant leak.
It wasn't a leak. It was a door, flush with the wall, its seam so fine that the bare lamp light barely caught it. Ines pressed her palm against the cold metal. It hummed faintly, the way a sleeping machine does.
"Pell, scan it."
The drone's lens whirred. "No registry match. No blueprint. Structural age reading: indeterminate. It was built, Ines, but not by us."
