The largest publicly known underground complex: SubTropolis is a business complex located inside of a 55,000,000-square-foot, 1,100-acre mine in the bluffs north of the Missouri River in Kansas City, Missouri, United States.

Ford had a hard time selling the Mavericks and stored them in there in the 70s.

It is pretty neat down there. Was down there around 2009.

I have driven a semi truck with a 53 ft. trailer into this complex multiple times. It dwarfs the truck. A surreal experience.

How have I never heard of this

Interesting! But the 'not publicly known' ones are probably even more interesting ...

Been there. They actually host a 10k race. It’s called the Groundhog Run.

Used to work 5 min from this, there are several smaller caves around the area. Fun fact: the temperature inside stays the same 70 ish degrees so none of the companies need to use air conditioning in the summer or heating in the winter

For all you folks just learning about this, there are several of these around KC. And more around Missouri. Cool rabbit trail to go down. Look for the underground RV park. 😀

Who owns this?? What are the laws around subterranean breakaway cities??

I liked it in "Kill Decision", by Daniel Suarez. Somebody please take some Muon counts down there. This place may be shielded enough to dramatically extend human lifespans, and quiet enough for noise-sensitive computation (e.g. QC). But it could also become a tomb.