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The energy required to evacuate a cylinder, or cave would be the same as you would get from refilling it, but it would be a method to store energy.
The underwater battery/"reservoir" idea is interesting. If you dropped a cubic meter sphere, 5000 meters below the sea surface, it could store the same energy as 50 identical 1 meter spheres elevated 100 meters above the surface.
No motor required
Quote from: Geezer on 17/01/2011 19:24:13No motor requiredI'm liking your thinking, Geez!You do mean no underwater motor needed, yes?
Well, my version uses a manual winch, but I suppose you could substitute a motor/generator