Which two methods are commonly used by divers for equalization?

The correct answer identifies two widely recognized equalization techniques used by divers: the Frenzel maneuver and the Valsalva maneuver.

The Valsalva maneuver is a widely practiced technique where a diver closes their mouth, pinches their nose, and gently exhales while keeping the throat closed. This action increases the pressure in the throat and helps to open the Eustachian tubes, allowing for equalization of pressure in the middle ear with the external environment. This method is effective and commonly taught to divers for managing pressure changes during descent.

The Frenzel maneuver, on the other hand, is a more advanced technique that is often favored by experienced divers, especially in situations where rapid descents occur. In this technique, a diver uses the tongue and throat muscles to compress air into the Eustachian tubes. The advantage of the Frenzel maneuver is that it allows for equalization to occur with less force, which can help prevent barotrauma, particularly in deeper dives or during rapid changes in depth.

Both techniques are essential for maintaining ear health and comfort while diving, enabling divers to effectively manage the changes in pressure that occur as they descend and ascend.