To this day it's still boggles my mind how a ginormous ship. Weighing thousands of tons.. stays afloat... I can take a piece of flat sheet metal drop it in some water and it sinks to the bottom...lol.. just doesn't make a lot of sense that's all I'm saying... same thing with how do planes stay in the air.. like I get the physics behind it!!!.. it still doesn't make any sense..lol
You say you get the physics behind it but if you did, you wouldn't be asking this question.
The ship floats from buoyancy and displacement.
Water also has a viscosity.
If you were to introduce air bubbles under a ship, it would sink.
Did you know there are mountains and valleys on the surface of an ocean?
In areas where there is more water (submerged valleys) the water lifts and when there is less water volume (submerged mountain) the water is pulled downward.
The weight of the ship is relevant to the size of the body of water and the empty space inside. If you were to fill all voids in that ship with water or something heavier than water - it would sink.
A plane can fly because of differences in what is called 'lift'.
Air rushing over the wing causes a low pressure area that is less than the atmospheric pressure pushing down on it.
The wing and the plane which is attached to it, moves towards the area of lower pressure. Nothing special is pushing the wing higher.
That action is the wing being drawn upwards.