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This looks like a novel and not immediately intuitive way of trapping air in a narrow space between two plates of metal. Neat.

There are other ways of trapping air between two pieces of metal.

I wonder how this compares against a sandwich of metal-bubble-wrap-metal. Or with styrofoam, or an injectable foam. It would also float. It would also withstand multiple punctures. I imagine it is cheaper than etching metal.

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