>>6145819Phil.
DUMBs are REAL.
Pneumatic travel exists. You can get from Los Angeles to New York City in 40 minutes flat.
There are "rabbit holes" or buildings in plain sight that have elevators down to such terminals. I know a few here in N.J. Don't take my word on it, but there is an abandoned BASF facility that has security patrolling. There might be something there.