I just can’t comprehend how there are still spaces where water does not enter even when submerged
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The air is already in the ship before it submerges. As water comes in underneath, it pushes on the air, shrinking its volume and raising its pressure. But if the space that the air is in is airtight, then the air won’t be able to escape: it has to stay where it is, because there is nowhere else for it to go. The pocket will shrink until its pressure is the same as the water pressure, but it cannot just vanish. In order to let the water into the rest of that space, you have to find some way to let the air out. If that doesn’t happen, the pocket will stay.
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