I watched this some time ago, Conspiracy Theory with Jesse Ventura: The Ozarks [Underground Tunnels], but was too busy to share it here until now.
Think it may be worth some digging. Informant going by White Rabbit? "Ark of Oz"? Far more banks for areas than are needed? Increase in earthquake frequency and natural caves being closed up? Some stuff seems far fetched but some things may have something to them.
At the least, I'm curious what what others think.
They did go into towns. I was only listening to the show while i did yard work, but it did sound like they went to some closed tunnel entrances and slipped into an improved natural tunnel and into a road tunnel at another point. They named names of towns and such as well. Been too long to recount any here without rewatching. Worth a view if you're curious.