Hurricane Irma...

I've thought that those in the twister zones in the US would be better off building underground, or partially underground as it would be the logical thing to do IMO.

Depends on the water table. We have our fair share of tornado activity here and lots of people do have basements. Once the power goes out you better have a generator or a solid battery backup on that sump pump. If you don't, that basement will be a swimming pool in short order.
 
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