Earlier quoted context omitted.
There is a German company suggesting to cut a large piece of rock (think: hundreds of meters in diameter and depth) lose and lift that by pumping water beneath it. A moving mountain, it would be. Totally crazy stuff, I should check if that ever made any progress. Here is a German article about it. As far as I remember, the real issue is that pumps/generators with the required powers are very expensive. https://www.in…
Omega Tau Podcast had a great episode about this company and project: https://omegataupodcast.net/299-gravity-storage/
I did not know that yet, thanks for pointing it out!