In the recording, a voice whispered, barely audible over the screech of the steel wheels: "It doesn't feel like metal to me. It feels like skin."

The file was buried in a shared folder titled “Field_Recordings_1994.” Most of the tracks were mundane: birds in a park, rain on a tin roof, the hum of a refrigerator. But track seven was different.

He wasn't in his apartment. He was in the carriage from the recording.

A cold draft swept through the room, smelling of ozone and ancient grease. Elias looked at the reflection in his darkened monitor. Behind him, the wall of his office wasn't drywall anymore. It was flickering yellow light, dirty linoleum, and a row of scratched plexiglass windows.

Elias hit play. At first, there was only the rhythmic clack-clack of a subway car moving at high speed. Then, a low, wet breathing started right next to the microphone.