Yeah, they are not going to reveal stuff to you, unless you do a F.O.I.A. request, that's Freedom Of Information Act, for those uninitated into the
process. Even then, having done a F.O.I.A. request, there are fees you have to pay for them to copy documents, which they can selectively give to you,
because you do not necessarily know the exact document number, or how many pages there are within a file.
On top of this, they can just refuse to give it to you, but you can sue that particular Government Agency, which may cost you an arm and a leg to do,
unless you can find a lawyer that will work for free.
Good luck with that.
The lawsuit route, would be called the "killing them with papercuts" route. If the Government does this, they are hoping you will give up because of
the exhorbitant costs, mixed with the amount of paper you will have to sort through looking through it like a giant jig-saw puzzle, and that you might
actually have to hire a professional former-Government agent to translate half of it, risking of course that this person may or may not be a
dis-information agent, or that they will bilk you out of money in the process, or even worse, be "disappeared" by some Government Agency you've
never heard of before, while you're busy elsewhere.
All of that is still "on topic" for any Mod's skimming through this, because it involves the process of uncovering the process of Government
Agencies hiding things like jkrog originally began this thread for, a Continuity of Government facility, or Continuity of Goverment support system
like these "underground tunnel systems."