The missile silo was a reinforced concrete structure with inside dimensions of approximately 146 feet in depth and 55 feet in diameter. A launch duct, with an acoustical lining, was located in the center of the silo. Associated installed equipment, structures, and mechanisms included a survey transfer station, silo closure door, retractable work platforms, a collimator room, hazard sensing devices, and a small equipment and personnel elevator operating between levels 2 and 8. Two exhaust ducts carried missile exhaust and ingested air from the flame deflector, through cascade vanes, to the surface. Equipment areas were located between the launch duct and the missile silo walls on nine separate levels.
Equipment contained on the various levels is described in the following paragraphs.
The silo closure door. This door was a steel and concrete structure designed to protect the silo from nearby nuclear blasts and resulting radiation. When closed, the door rested upon a seal with wheel trucks clear of the rails. Door locks held the door in position, preventing movement from shock or vibration. The silo closure door system consisted of the closure door, wheel trucks, track rails, buffers, and a door-actuating system.