Cross-passage 12, between lines A and C
LIGHTING
Emergency fluorescents — one buzzing, one dead, one strobing
GRAFFITI
A crude compass rose in blue chalk, arrow pointing deeper
AMBIENT
Silence so thick it hums, occasional click of cooling rail
INFRA
Concrete block walls, cable trays overhead heavy with bundled wire
AIR
Cool and still, smells of ozone and old concrete
DEPTH
0.5 miles from surface access