Apartment 4C
You
A hull cleaner on the Keel Ring, known only by your room number. Nobody important, which is exactly why you're useful.
The story
Nine days ago, the Drift didn't turn.
The surface, which everyone calls the ceiling, became too hot, too bright and too loud to live on, so people went under. The Drift is the biggest of the cities below: forty thousand people and no engines.
For generations it rode the same loop of trusted currents. Then, at the top of the loop, it kept going. The water is colder than it should be, and the Helm won't say where the city is.
The game follows you through about fifty days, from your first shift on the hull to the edge of the map.
The forecast board still shows numbers, but they're wrong. The water is too cold for this depth.
The fish are ones nobody has a name for. At night, when the city sinks and the sparks rise, something bigger rises with them.
The Helm says there's no cause for alarm. They're planning expeditions past the city's edge to see where we are.
You won't be on them. You clean the hull.