[steve-howard]

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.

[maaaats]

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

[dekhn]

Huh, I thought this was the val salva maneuver.