The primarily defense of this fort is its secrecy and camouflage. It isn't surprising then that almost all of it is hidden underground, with only a few structures peeking above the surface.
This entrance is one of them. It is essentially just one large elevator, big enough to fit a car. Upon a request for access, the elevator will be send up with a couple of soldiers inside, who will take position behind the bulletproof windows.
(This model is part of the BB project concept designs for the "Underground base")
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