Going from floor 2-3 of a lab, the room was one of the locked rooms, which had a bunch of bedrooms, toilets in a corner, and reinforced glass I could see the active terminal through. No up staircase exists, and no doors could open. There was a down staircase, but it ends up going to four rooms, three of which have a few items, and the last was a turret room with no exit.
Sort of an edit: I reloaded my game (I saved before going downstairs, deal with it) and I went downstairs again and now it’s the same area, but an upstairs exists, and no downstairs.