<> wrote:

An old submarine hull (ridged structure) would work nicely as a reservoir.

That's an underwater reservoir:

That is MUCH too small. It has to have hundreds or even thousands of times
more capacity than that to hold a significant amount of energy. The water
pressure is low. The reservoir is not far below sea level. It is not like a
dam with water falling hundreds of feet.

Typical pumped storage lakes are 30 to 50 million cubic meters.

- Jed

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