When you dive below the surface of the water you will feel pressure in your ears. You can cause damage to your ears if they are not properly equalized. By using air from your lungs you can balance the pressure
Here is how you equalize:Grasp your nose, seal off your nostrils, and gently blow without allowing any air to escape through your nose or mouth. You should hear a slight popping sound.
You should equalize every few feet as you descend, however, do not force equalization. Do not descend any deeper than you can clear your ears.
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