Answer:
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Explanation:
If the pressure inside the mask is not equalized with the pressure outside (as the diver descends deeper underwater), it can cause a squeezing sensation on the face, particularly around the eyes and nose. This sensation can be uncomfortable and may lead to difficulties in equalizing pressure in the ears and sinuses as well.
In more severe cases, failure to equalize pressure in the mask can result in barotrauma, which is damage caused by pressure imbalances. This can include issues such as sinus squeeze (sinus barotrauma) or facial barotrauma, which can cause pain, bruising, and potentially more serious injuries.