The idea the men might someday fly is "sheer crackpottery."
You are clearly not an engineer.
Nope. Just a PhD Analytical Chemist with Nuclear minor. I occasionally make noises like an engineer, though, sufficient to have 24 issued patents, with more coming, and two R&D 100 awards.
And I say again, "universal geothermal energy" is sheer crackpottery. Having to drill 4 kilometers down to get to a temp of the boiling point of water (not a very efficient thermal differential) is NOT practical, and unlikely to ever BE practical.