SCP-966's containment chamber consists of three different rooms: The first room is a J-shaped corridor with three doors, two of them leading into other rooms while the third leading to a control room. The door to the room requires a level 3 keycard to enter. The control room can also be entered directly from another room, but the door still requires a level 3 keycard.
The control room contains a few control panels, tables, chairs, and a door leading into the chamber itself. The chamber is featureless outside of a security camera overseeing the room and a pair of night vision goggles that can be found on the floor. Multiple SCP-966 instances may also be found in this room.