High-Speed Transit Tunnel Failure

the prompt

High-speed transit tunnel: a vehicle navigating through a rapidly destabilizing section while automated safety systems fail intermittently. The path is still viable, but closing fast.  
Forward tracking: tunnel rushing past at extreme speed, lighting stable but flickering slightly. 
First instability: panels begin shifting out of alignment, subtle at first. 
System alert: sections ahead flagged as unstable, pilot forced to adjust trajectory. 
Falling debris: small fragments dropping into the path, increasing in frequency. 
Tight navigation: vehicle weaving through partial obstructions without reducing speed. 
Near-contact: a panel slides inward late, barely avoided with a sharp lateral move. 
Reduced visibility: sparks and dust filling the tunnel, obscuring depth perception. 
Close pass: maintenance structure rushes by at high speed, minimal clearance. 
Trajectory drift: control systems lag slightly, requiring manual correction. 
Critical segment: a narrowing section ahead, still passable but closing. 
Full commit: pilot accelerates through, no room for hesitation. 
Exit burst: vehicle clears into an intact section, instability fading behind.  
High speed, tightening space, repeated near-misses, but always a survivable path, no full entrapment, no total collapse.