The Telecommunication Center is a key facility for the military strength of the Korea-US allied army and it consists of three stories above ground for a telecommunication center and five levels underground for parking lots. The central processing unit (CPU), the most important facility, is surrounded by 2m-thick concrete. The access to the CPU can be made only through a blast proof door. In order to block out explosive pressure inside the building, it is designed to be equipped with a special facility including blast valves, etc.