What is a key sign that an ear has been properly equalized during descent?

Feeling a pressure relief in the ear is a key sign that equalization has been successful during descent. This sensation typically occurs when the pressure inside the middle ear matches the surrounding water pressure, allowing the Eustachian tubes to open and equalize the pressure effectively. If equalization is not achieved, divers often experience discomfort or pain, which indicates that pressure is still imbalanced. Recognizing the feeling of pressure relief is crucial for divers to ensure they are descending safely and to avoid potential ear injuries, such as barotrauma.

Other signs, such as a ringing sound in the ear, increased hearing sensitivity, or complete absence of sound, do not reliably indicate successful equalization and may suggest other issues unrelated to effective pressure adjustment during a dive. For example, a ringing sound may indicate temporary pressure changes or stress on the auditory system, but does not confirm that the pressure is equalized. Similarly, changes in hearing sensitivity might occur for various reasons and do not specifically relate to the successful equalization of ear pressure.