Initial view: This cabinet contains power equipment to run the site's wire-line (telephone) communications systems.
Panning right, the large cube-shaped box is AC-101, the air conditioner for the control center.
Further right is the emergency escape hatch. The dark tunnel goes back about 10 feet (3 m) and joins a vertical air shaft equipped with a ladder leading to the surface. The hatch is normally closed and locked.
Continuing to the right brings you back to the telephone equipment cabinets.