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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Idiot. Ships float because it displaces their weight in water. What is an 'air pocket' anyway? lol.
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.
The hull is what allows air to displace water.
If you filled that hull with any other substance heavier than water, it still displaces water, but it will sink.
If you fill that hull with anything less dense than water (vegetable oil, liquified gas, air) it will float.
Even with a very heavy lead hull this works. If the hull is too thick, where its total volume (including its contents of air/oil/whatever) is more dense than water, it will sink below the water's surface and the pressure difference between water and air can be corrected, the air escapes like a bubble would, back to equilibrium. But say you cap off the hull before it sinks...now it still might sink but as it is sinking, pressure of the water above it grows and will cause it to burst. However, if the air inside it was pressurized (like a submarine), then it might not burst. The increased air pressure gives the sub more density, as density increases proportionally with pressure.
The reason airplanes are pressurized is to mimic conditions at sea level for humans because its comfortable. You asked what an air pocket is, which is related to a low pressure zone of air in the atmosphere that an airplane passes through, causing it to dip in altitude. But you know the thing!
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.