Read Richard Feynman's account of driving into the most secure place on Earth - and then driving out via a downed fence, only to come in again, and again and again. It was then they told him not to be so silly.
The place was Los Alamos, the secrecy, the Manhattan project.
I used to take money to Bern. New money by the Dak load. I once drove my car over a similar downed fence and parked at LGW for the day. When we got to the (preloaded) aircraft, there was an old guy asleep in a van near the rear door. When we got to Burn, we were met with tanks and a lot of soldiers.
As it happens, I had a snooze on the money on the way down.