[LB7 (OP)]

- see below

[Tomassci]

I hadn't read it so properly, but i think it can't work.

[LB7 (OP)]

I come back with that idea:


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With water (blue color) and gravity (vertical). White shapes are objects with air inside. The water never lost a potential energy from start (parallelepiped) to end (cube). I recover an energy from the modification of the shapes of the white shapes.

It is more logical with an intermediary position:


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Each white shape reduce one dimension and increase the other. Even each white shape don't move in the altitude, the pressure from other white shapes is there and in the other dimension it is only water.

And with one layer:


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The center of gravity of each white shape keeps constant its altitude. The pressure from water is all around, the energy to deform the white shape with ONLY water is 0. But each white shape has a force from the shapes below, that force create the energy.

[LB7 (OP)]

With one layer, there is a net force to the left on each white shape. With several layers (imagine the size of the white shape smaller than I drew), the net force on each white shape is at least at start 0 N. The lateral walls need nothing, the potential energy of water doesn't change. So the energy to move to the right the white shape could be at 0J. At final, there is the energy from the deformation of the white shapes.