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guarantee it's not that easy...

I am sure that my idea is gross oversimplification, but am also pretty sure that some variation of this would work just fine. It seems to me just a matter of making the cone larger or heavy enough.

Obviously it's not an easy problem to solve, but I guess I am wondering why.

Have you ever tried to hold on to a small air filled rubber ball and swim to the bottom of the deep end of a pool? Its impossible. Now think about how that is magnified 1 mile below the ocean. A small amount of buoyant hydrates create a lot of upward pressure.

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