Re: I would build down not up.
Second thought.
For the same cost as building under the ground you can build under the Gulf/Indian Ocean/Red Sea/etc. That does not get hotter than 30C even in a 50C heatwave
Second thought.
For the same cost as building under the ground you can build under the Gulf/Indian Ocean/Red Sea/etc. That does not get hotter than 30C even in a 50C heatwave