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I can pop my ears by plugging my nose and making a "k" or "g" sound. Comes in handy since my Eustachian tubes are essentially useless.

What I described above is called a BTV. This sounds like a Frenzel, which is the one most experienced freedivers use. https://en.m.wikipedia.org/wiki/Ear_clearing

Huh, I thought this was the val salva maneuver.