Dami Lee did a pretty good explainer on Derinkuyu. but specifically at Underground Cities: Surviving DUNE's Deadliest Planet?t=600 there's twelve second on building a hay bale house and pouring concrete over it and then having a cow sacrifice the formwork.
It could be aerated hempcrete.
Styrofoam's precursors are tractor fuel
www.sae.org...2013-24-0108: Styrofoam Precursors as Drop-in Diesel Fuel
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.Impossible is just something we haven't done yet. -- Langley Outdoors Academy
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