Purchase a spot in a cave in Kansas for $20,000 (based on $1000 per lineal ft.) add $1,500 per person for food and maybe hope to survive :S
No mention of how I can run off propane, electric, dump my tanks, etc.
I think I'll take my chances above ground.
A facility like this would however make sense as a storage rental.
Kansas Cave
'03 2500HD CrewCab SB 6.0 Gas 4x4
'04 Northstar Laredo SC
Bilsteins 5100
2014 1500 Silverado 5.3 Double Cab
1951 Chevy 3100
Formally OBXcamper