This is an old trick swimmers often use to remove water from their ears. The method is simple: breath in deeply, then close your mouth and gently pinch your nostrils shut. Very slowly, blow the air through your nose. You should soon hear a popping sound, and if you do, it is working. To finish, tilt your head to the side to allow the water to drain out. It is important not to blow too hard, as this can damage the eardrums.
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