https://en.wikipedia.org/wiki/Underground_rocket

 

why not

there's modern variant in croatia, they break stones with tiny plasma bit (you can watch on youtube)

also you can make large shit >1m wide and enjoy lava

or maybe it was slovenia..

that's hot

enough to make steam for power

you can dig deeper obviously, its just not really tried, and maybe only possible when the crust is narrow

also you don't always want the hottest/most performant configuration

400 is some average, you can obviously do better in better region, their main point is that with their tech it is feasible everywhere or in most places

this will even work in antarctica, or in places where there's no fuel at all

Fossil fuel jew

It's always +5C 1m underground. Why we don't dig houses?

geothermal heat is already about to make it big

Holy... you might be on to something

https://en.wikipedia.org/wiki/Ground_source_heat_pump

 

ppl pump the heat to their houses, it actually pays off yet its relatively complex to do and in colder climate basically it doesn't really work (just alone.... probably still saves few bucks when the weather is better)