Rising temperatures erode human sleep globally
This comment won't do well right now but I suspect in the future we may come back to this idea.  I believe more work needs to go into automation of forming/welding frames for underground homes as the temperature is rather constant under ground. <i>3D printed/molded?</i>  Some locations will need specially built units that can handle moisture.  I have probably binge-watched too many mining/tunneling videos but I could see this technology becoming affordable to the consumer through technological optimizations, maybe?  Anyway moving the home under ground could provide additional room above ground for a garden or parking spots.  Underground homes would also be tornado resistant.  Another advantage is energy efficiency or moving towards being carbon neutral.  There are concrete / shotcrete companies making carbon absorbing material now.<p>I am thinking of the real world example of Coober Pedy, AU [1]  They have subterranea hotels, mines, homes, recreation facilities and more.  If I ever went to AU that would be my first stop.<p>Anecdotally my home is partially earth bermed and even on <i>hot</i> days <i>hot being around 101F</i> it is cool in my home and I do not even own a HVAC unit.  One of the many reasons I moved was due to heat and sleep issues.<p>[1] - <a href="https://en.wikipedia.org/wiki/Coober_Pedy" rel="nofollow">https://en.wikipedia.org/wiki/Coober_Pedy</a>