Eli5 Underwater caves with air

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How are there caves deep underground with air pockets? How does the water not fill into it? And if a person “lived” down there would the breathable air run out?

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Take a bowl and put it into a bucket of water straight upside down. You’ll end up with an air pocket in the bowl and it won’t fill with water. It’s the same
Thing with an underwater cave, the air sits on top of the water and water can’t fill the space unless the air can escape

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