https://www.google.com/search?client=firefox-b-d&q=london+un...
You could probably drill sideways into rocks and pump heat into the mountain for a certain period of time, but on a multi-month or year time scale, it would catch up with you after you had saturated it.
https://www.google.com/search?client=firefox-b-d&q=london+un...
You could probably drill sideways into rocks and pump heat into the mountain for a certain period of time, but on a multi-month or year time scale, it would catch up with you after you had saturated it.