Very nice use of lighting effects to draw the eye's focus to the center of the piece. The light hitting the surfaces were well rendered I feel, and the piece as a whole does convey this cold, unsettling feeling, as befitting a torture chamber of sorts.
However, I feel that the bottom of the image requires something to hold the viewer's attention, like a table on which victims are placed, or some dangerous tools hanging on the background wall.
Otherwise, quite a successful piece overall. Its good!