Clang!
A metal door slammed shut as a black car drove inside a barely noticeable basement. Inside the corridor was pitch black, only the dim lights of the car illuminated the surrounding a bit as it drove in.
At the front, a circular shape was drawn on the floor, indicating where the car should be parked. As soon as the car got there, it stopped but the engine was not switched off.
A dull thudding sound reverberated this time as the circular platform shook a bit before detaching from the other parts of the floor. At a slow speed, it started descending, taking the car with it.
As soon as they touched ground again, lights automatically started switching on, bringing the overall outlook of this military-like bunker.
A simple but fairly big hall, 2 bathrooms, a reinforced door and walls, a secret exit door, this was everything that was in this bunker. It was not too big; it was just the perfect compact that any secret agent would like.