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I'm not interested myself living in one, but I'm curious how others do that. If you have more photos feel free to share that along with your insights and experiences.
I read that all over Siberia houses dug into the ground were used to live in. The trenches were very deep and they actually built log houses inside them.
> hit clay
Yes, the soil is layered and below the top crop layer it is more homogeneous and compacted, basically clay. Consider making pots too now you are at it.
Hereabout they used pits to create cool places to store foodstuff, like potato and veggies. Even built freezers (they insulated the pit and filled it with ice during winter), because as we dig lower the temperature become constant at one point (and warmer if we continue to dig).
I'm gonna make sure to check out the book you posted. Thanks.