Giive me examples becaus I honestly cant think of a single thing to describe
Err, okay. I am doing some guesswork here based on what you described up to now:
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Hard fluorescent light and gray metallic floors greeted the prisoners-made-agents as they slowly flowed out of the gym on their new mission. A long hallway stretched to one side, its disturbingly low ceiling adding to the already apparent feeling of claustrophobia most of them must've been getting from being in a windowless facility for such a long time. Locked doors on each side of the hallway, a uniformed guard at each one, upheld the appearance of a prison complex, and for some reason, being on the other side of those doors haven't made it much better.
The guard closest to the gym turned his head slowly and leered at the group. He looked as if upholding eye contact would be enough to make him open fire. The other guards weren't paying attention, appearing almost statue-like in the slightly flickering, white light.
As if on purpose, the emergency map on the wall had illigible markings, most likely known only to the facility's inner circle. The group's best bet to get information seemed to be the guards themselves, or trying to open every door and hope there were no repercussions. And if the length of the hallway was any clue as to the facility's actual size, they had alot of work ahead of them.
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I don't think I added anything not mentioned before, and there's enough to respond to. I think.