I realized the same hub system I plan to use for building domes will also work well for building tinnels as well. So I can dig a "trench", add a tunnel frame, cover in tarp, and cover all that in soil. Connect several half burried domes and I've got a nice place to live.

@dwarvenallfather Check your soil types before you bury anything. Expansive soils will crush anything underground like a soda can when it rains if you don't design with them in mind.