"The main research building, twelve stories high, almost a block long, bang in the center of the enclosure. The facility mainframe is on the eighth floor. They use a personal I.D. transponder system to track people through the building. Motion detectors on every floor are linked in to pickups that read a signal from an employee’s badge. Every badge gives off a unique signature. If you show up in an area for which you have no clearance, alarms go off. If the system picks up someone who’s not wearing a badge, lots of alarms go off.