bunkers for the elite no doubt.
https://www.springfieldunderground.com/advantages
Not exactly. It’s mostly commercial use property. Warehouse storage. Things that need refrigeration like cheese and many other types of stuff. I did a lot of research on it a few years ago.
It’s right off I44 and 65. Initially a mining area for lime etc. IIRC.
“refrigeration like cheese and many other types of stuff”
I read once that we had like miles and miles of caves full of surplus cheese. Had something to do with why the govt wanted to give away cheese that time.