The lower level of the equipment room contains a motor generator and supports for twelve large storage batteries. The batteries themselves were removed from the missile launcher during deactivation in 1993. An electrical surge arrestor room is located on the southeast exterior wall of the lower level. The numerous surge arrestors inside were designed to prevent electronic equipment inside the launcher from being damaged by electromagnetic pulses resulting from nuclear explosions.
Visible in this shot - in its retracted position - is the "B‑plug," a piston-like, steel security door operated by an electro-mechanical actuator. The silo cannot be entered until the B-plug is retracted.