On the outside, it is merely an old, abandoned store, but after some snooping and probing, one can discover a trapdoor with a ladder leading into a vast training area. That is...if all the booby traps and security measures were avoided or deactivated. Otherwise, be prepared to be rounded up by the law.

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Training Area

The sky is blue and an unknown source of light keeps the area illuminated. What happens down there stays there since everything is pretty much sound proofed.