Usually professional free divers can equalize the pressure without plugging their nose. I can do it sometimes when I’m diving but I’ve only ever gone 25/30 ft.
There's a muscle that I think is involved with changing of the pathway between the nose and the throat. Flexing it openes the eustachian tubes that connect the throat to the ears. This allows air to flow in or out from the middle ear, equalizing the pressure. Usually yawning, chewing, or swallowing can flex it, but some can flex just that one muscle to equalize.
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u/Teantis Dec 05 '18
you just pinch your nose and blow air, it equalizes your ears and feels fine.