The Big Book of Su Doku

A missile silo for enclosing the missile prior to launch. The silo includes a closure (door) which is hardened against nuclear induced overpressure, ground shock, and radiation to provide a massive structure, usually of concrete and steel construction. Silo closure actuation means is provided to open the door to permit launching of the missile. No source of power, other than missile propellant energy is required for opening the door.