when we are underwater, how does water not get inside our bodies through our eyes, ears, nose and every other orifice?
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It depends on what you mean by inside.
It is like putting a cup underwater upside down full of air. With your ears if you turn sideways with the ear hole pointing up the air bubble will come out and water will come in until it hits your eardrum. If you dive head down you are going to get water in your nose, but you can easily replace the bubble in your nose by blowing air out of your nose.
Water pressure compresses the air and shrinks the air bubbles like your farts and the bubble in your nose and even the air in your lungs. In your body, the further down you go, your air will eventually smush to nothing and will come in. Have you tried swimming down more than about 3 meters? you will feel the pain in your eardrums and the force of the water trying to go into your lungs is harder.
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