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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OK, sure, but I don't think you are on the right track regarding the OP. Air & air pressure has nothing to do with a regular ship floating or sinking so it's not part of the absurd 'gravity does not exist' part this OP was on about explaining how ships can float. It's the weight of the ship that needs to displace the same amount of weight in water. If the weight of the ship can displace its own weight in water, without exceeding the freeboard height, it will float.
Submarines are completely different. They use air/water ballast to rise or sink, to overcome their natural buoyancy, so while you are on the right track as far as air pressure relating to submersed vessels, the OP was referring to regular ships (non-pressurized) that float.
Regular tankers/ships are not pressurized, nor are they air-tight as far as double-hulled vessels are concerned, so having air between hulls only protects their cargo against ruptures, but does not increase buoyancy.
The OP asked if anyone understood the "Gravity is not real but just different densities" conspiracy theory.
I responded with my understanding of it.
If he had asked if anyone understood the "accepted theory on Gravity" then your answer might have some merit here :)
You can understand a concept without accepting it's "correctness". Understanding is a cool concept.