Change the ceiling lights to either strip lights or thin area lights. Have them going off into the distance a little further and add some gradient fog fading out into the background colour. Maybe make the background colour green also.
Dutch the camera slightly (that mean tilt it on its bank axis) to give the scene a more uncomfortable look.
Maybe add some doors in the corridor, the closest one being the most 'normal' with some normal, yellow/white light spilling from around it.
Add some grunge in the edges around the skirting board and bottom/tops of the wall.
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