This is a method for clearing any water that might accidentally get into your mask while diving. While pushing with your hand on the upper part of the mask’s frame, slowly blow air from your nostrils while gradually looking upwards towards the water’s surface. This will cause any water to drain from the seal around the nose/upper lips area.
Blow Air From Your Nose
Mask Recovery
There are instances where your mask is accidentally knocked off, such as by another diver’s fin. If this happens, calm yourself, don the mask again, and perform the mask clear technique.