[efattah]

If you learn the yogic technique of kechari mudra, you can close off your eustachian tube openings with your tongue, by sliding your tongue up the back of your nosepharynx. It takes about 8 weeks of daily practice for the frenum under the tongue to stretch enough to do that, but once you master it, you can feel the openings of each eustachian tube with your tongue, and close both or just one; in that sense you even have the power to equalize one ear and not the other, by blocking one opening and then doing frenzel. You can also plug one nostril by blocking the passage with your tongue in the nasopharynx. Using this method, you can frenzel by plugging only one nostril, and blocking the other with your tongue.

Once I mastered the technique I amazed friends by making air come rushing out of one nostril only, then the other, without using my hands at all.

Kechari mudra could be used to prevent the water from escaping the eustachian tubes, once they have been filled with water. Alternatively it could be used to prevent water from entering the eustachian tubes during flooding of the sinuses.

Unfortunately the anatomy of the nasopharynx makes it impossible to close the nostrils via the tongue, while keeping the eustachian tubes untouched. If this were possible, then kechari mudra would allow frenzel to be performed without using your hand to pinch your nose. Instead, in reality, if you block both nostrils with your tongue, the side of your tongue will cover each eustachian tube, making equalizing at that moment, impossible.