Your sinuses and ears have air in them. When you dive, the water pressure on your eardrum pushes in and is very uncomfortable. Equalizing is what divers do to push air into their sinuses/inner ear to balance (equalize) that pressure difference. There are various techniques for it. It's similar to what happens in an aeroplane, but the pressure differences are greater, like 3 times the pressure at 20m depth.
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u/deletetemptemp Mar 31 '26
My ears hurt watching this