>>1548452Water Tables and Inconsistent soil makes digging holes difficult.
Many cities in Asia do this thing where they put a thick layer of rock to discourage digging because it impairs the structural quality of buildings.
I know that if you get up on a hill and dig a large hole and then put logs over it and cover it with dirt, rocks and grass you could in theory build a hovel.
Here is a diagram of what it SHOULD look like.
Of coarse I would avoid building near largely populated areas because people wil; ruin it, think of it like a snow castle, hide it from other people because they could destroy it.