Why is it water only enters the ear sometimes?

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Water does not always enter the ear when submerged due to the presence of atmospheric gases in the ear canal, which must be displaced for water to enter. The orientation of the body affects this process; for example, if one ear is facing down, gas pressure can prevent water from entering that ear while the other ear may fill with water more easily. Individual variations in ear canal structure also play a significant role in how water interacts with each person's ears. Therefore, the experience of water entering the ear can differ from person to person based on these factors. Understanding these dynamics can clarify why water only sometimes enters the ear during swimming.
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Say your in a pool and u put your whole body beneath it, why is it that the water won't always enter your ear?
 
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Prior to dissension, the "open" part of the ears(the outer ear canal in this case) contain atmospheric gases.

In order for water to enter, the gases must exit.

If you descend "left ear down", the gas pressure will prevent water coming into your left ear(to a certain point), but your right ear(pointing upwards) will easily release it's gases and flood with water.

As different humans have different ear canal structures, and we descend in water in different ways, what happens to one person is not the same for another.
 

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