Ref the comment about moving to Central America, I have not totally discarded that option.

I speak Spanish and have a lot of wonderful family down there with a choice of several countries to live in.

However, if the micro nova, pole flip hypotheses have any truth to them, the waves crossing Central America will NOT be survivable in any kind of shelter I can design.

Plus, that entire area is full of volcanoes that will be lighting up.

So, the mountain you decided to dig your cave/refuge into turns out to be an active volcano.

I also like NM because my kids, grand kids, etc. can come visit easily and not have to fly in.

Lastly, remember that this is a business idea, so I need to be near customers.