You drop through the grating and land on a cold metal catwalk inches above a lower service floor. The red glow from the panel fades behind you, replaced by a thin line of emergency light that crawls down the corridor. Somewhere nearby, boots scuff and a radio crackles with clipped instructions. Your satchel thumps against your ribs as you move, careful not to let the straps catch on exposed wiring. The city outside never stops breathing, but in here the sound feels muffled, like you are falling deeper into its lungs.

A maintenance door ahead is half open, leaking warm air and the faint scent of ozone. Beyond it, conveyor belts hum past stacks of unlabeled crates, and a surveillance camera pivots slowly on its mount. The camera’s indicator light stutters, searching for a motion signature in the dim. You spot a service ladder leading up into a ceiling crawlspace, and a narrow cable tray that runs toward a control cabinet. Every path promises escape, yet each one also promises attention.