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But let me summarize, what I think I understood:

- The plug has the same hight as its diameter and would be lifted up to half that hight. Therefore the energy capacity scales as a power of 4! (Volume times hight)

- Apparently there are are steel rope cutting techniques employed in South African mines that can be used to cut such a plug in place.

- A plug of 500 meters would be enough for Germany's electricity needs for a few days

- I don't remember were one would take the water from but it doesn't seem to be a big issue

I did some maths on the pressure involved and it seems to pan out. So my question is mostly how would you go about sealing such a plug? What other problems do you see from an engineering point of view? Is is geologically sound?