It’s after midnight. From this mountaintop perch, he can still see the radioactive remains of what used to be Washington, D.C., illuminating the horizon as he exits the helicopter. The nuclear glow serves as stark proof that the intelligence community failed to foresee and prevent the worst, but at least someone was smart enough to build this mountain bunker in rural Virginia for him and his fellow spies to regroup and survive. He opens the reinforced steel door and begins his descent.
Source: The Secret Mountain Our Spies Will Hide In When Washington Is Destroyed