Eli5, how is it that Scuba divers typically have to squeeze their nose and blow to equalize the pressure in their ears every few feet, but those who free dive can sink 20-30 feet in 10 seconds, and be fine while not visually equalizing?

Question

Is the ability to breathe what changes this, or is there some other technique behind it?

In: 55

Answer 1

Experienced SCUBA divers can equalize without pinching. I did it all the time when I used to dive almost daily.

I think it is because your eustacian tubes get more clear/relaxed, or simply “better” at connecting you inner ear to the nasal cavity.

Free divers dive a whole lot, they gets tons of practice. Still, some do the pinch thing.