Rat colony observation point, disused siding
LIGHTING
Infrared camera feed on a dusty monitor — green-tinged movement
GRAFFITI
Research station labels: 'RAT CENSUS POINT 14 — DO NOT DISTURB'
AMBIENT
Scratching, squeaking, the rustle of hundreds of small bodies
INFRA
Modified track bed with feeding stations, motion sensors, cameras
AIR
Warm, animal smell, strangely domestic
DEPTH
200ft from passenger service