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I respectfully disagree. Freedivers always (except for no-limits) dive head down. And they equalize with just one lungful of air. There are different techniques for equalizing, and the worst one (the Valsalva) is the one many beginning scuba divers use because, though it's the worst method, it's the easiest to learn. If that's what you are doing, then, yes, equalizing head down might be very hard. I find the Frenzel to work much better for me, and it works in any position and with limited air availability (freediving). With unlimited air (scuba diving) it is even easier. There are other methods as well, and a good instructor can teach them to you.It took me a few dives to figure out that I needed to have my ears above my heart to equalize. A great many people are like that. I don't think it has anything to do with technique, just how your ears are constructed.
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