Divers should already learn the method according to Frenzel during basic training.
How does the Frenzel method work?
You keep your nose shut and you make the “K” sound with your mouth closed. By doing so, the vocal chords close the trachea and the tongue presses the air of the oral cavity backwards. Thus air reaches the inner ear, whereby the pressure compensation can take place better there.
Important to know: The Frenzel Method only works for pressure compensation if you use it in time and if the pressure difference is not too big. If you fail to use this method, the risk of a barotrauma increases
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