when we are underwater, how does water not get inside our bodies through our eyes, ears, nose and every other orifice?

Question

when we are underwater, how does water not get inside our bodies through our eyes, ears, nose and every other orifice?

In: 504

Answer 1

Almost every orifice closes tightly enough that water (at least at surface-pressure) can’t get in.

The only one that doesn’t close is the nose. Inexperienced swimmers will sometimes manually hold their noses while underwater. Experienced swimmers can squeeze their diaphragms (lung muscles) to create just enough air pressure to counterbalance the water pressure.