A night shift maintenance worker investigating a ventilation shaft discovers a sealed Department of Defense bunker hidden beneath a city hospital. Inside Sublevel B4, he uncovers a chilling decades-old medical secret experiments.

An immersive psychological medical horror audio story, SCP-style containment mystery, and subterranean creepypasta.

About Twilight Rex:

Bringing you high-quality, grounded accounts of the terrifying and the unexplained. If you are drawn to dark events, atmospheric creepypastas, and immersive horror stories that hit a little too close to home, you're in the right place.

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🎵 Credits & Attribution:

• Story by: Twilight Rex

• Audio & Editing: Twilight Rex