What should earplugs never be worn for during diving?

Wearing earplugs during diving to prevent water from entering the ears is not advisable because they can interfere with the natural function of the ear during pressure changes. The ears need to equalize pressure properly to avoid discomfort and potential injury. Earplugs can create a barrier that prevents the normal movement of air and water, which is crucial for managing pressure differences as a diver descends or ascends.

When diving, the equalization of pressure between the outer ear and the inner ear is essential to avoid barotrauma, which can occur if the pressure is not balanced. Using earplugs can hinder this process, leading to increased risk of discomfort or injury. Therefore, it is essential to use other methods, such as the Valsalva maneuver, to equalize pressure rather than relying on earplugs.

Maintaining the ability for the ear to properly equalize without obstruction is critical for safe diving practices.