What I don't understand is that this "theory" seems really easy to disprove. Why do things travel down instead of up or right or left?
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lol. OK sure, but the only reason a gap between metal plates would exist in a steel hull design would be for protecting the contents, like oil. It is not designed to increase buoyancy since the extra weight has to be factored in hull length, shape etc. without the extra weight, it would naturally be MORE buoyant since it would need to displace less water.
Oh, how compelling. They are just as wrong as you are. lol. Only air-tight ballast tanks can work to add buoyancy.