This is the entrance to the missile complex.

Despite what you may think, the complexes were NOT hidden. They were considered to be a 'retaliatory' system, and they wanted the Soviets to know that they were there. They were designed to withstand a direct nuclear hit and still fire the missile. The crews consisted of four people on a 24 hour shift. All site systems had to be inspected every 12 hours. The sites had doppler radar intruder detections systems set up all over the place.
To gain access to the silo / control complex, the Commander had to go through four different checkpoint, two which involved specially coded responses.
Once the commander and team had been approved through the capture area, they had the final check. If this was good, the first blast door was opened. The damn thing is huge, designed to survive a direct hit and overpressure of 300 PSI.

There was a second blast door before moving into the complex proper.

Just inside was the Missile Control Complex and Launch Control Room. There were beds and a kitchen on different levels. All areas of the complex were "No Lone Zones", meaning that no-one was to be there by themselves - if you were, you were considered compromised until you could prove otherwise.
The only place where you could be alone was in the galley.





