Whales have some flappy thing around their blow hole that they seal shut when under water only to open once above. I’m not aware of something like this for humans, yet the air does not gush out when we go underwater
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You can form an airtight seal with your lips to keep water out and air in your mouth and if you’re not swallowing or breathing water won’t just go down your throat.
Your nose is full of air and points down. Full your sink with water and grab a glass and shove it in the water opening down. It won’t fill with water because the air can’t escape because air won’t sink in the water. That’s how your nose works. If you flip upside down under water without blowing out your nose it will fill with water.
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