James,
A brief article I saw on underground homeless camp in Kansas: Underground homeless camp cleared near the East Bottoms.
Although the article does not give much detail, I find it an interesting use of space, staying out of the way and a lesson to learn regarding people who may be close to your proximity without one even knowing it. It also drew my mind back to the Bielski partisans and the camps they dug in Naliboki Forest.
God Bless, – John in Ohio