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In cold water diving, this is (IMO) sound practice. Losing your mask, or having a major mask leak can be shocking if the water is cold. Dipping your face in the (cold) water before starting the dive prepares you for the shock of cold water hitting your face and reduces the risk of freaking out you lose your mask during the dive. Less risk of freaking out.I remove my mask after entry and allow the water to cool my face to water temperature any fog is almost gone for the entire dive.