Clearing the mask means removing water from the cavities of your diving equipment. To do so, you press the air in the cavity which displaces the water.
You can easily clear the diving mask yourself: Hereby you slightly press against upper rim of the mask and breathe out through your nose. By doing so the water that seeped in is pressed out.
Your regulator must also be freed of water sometimes. Hereby the best thing to do is to use the so-called air shower.
When snorkelling, clearing is easier: You clear the snorkel with means of a strong air blast with your mouth.
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