Air is a thing that exists. You might not be able to see it but you can feel it moving like with wind, or blowing with your mouth. Air can be compressed but it always takes up some space, even underwater. I’m sure you have seen bubbles before as an example of this.
When a container like a ship goes underwater the air tries to escape towards the surface as water pushes in under the force of gravity. But if there is no passage upwards air can become trapped underwater. That is how air pockets can be created in sinking ships.
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