I get that at a surface level, no pun intended, it’s to prevent water from entering the nostrils. But is there more to it than that? I can swim in a pool without plugging my nose and don’t have any issues. Does water pressure play a role, are there certain depths where nose clips are/are not required?
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So they can equalise the pressure in their ears (the Valsalva manoeuvre) without having to pinch their nose with their hand as they descend.
I’ve had to scrub some dives because of having a cold and not being able to pop my ears, you hit 15m going down and haven’t equalised your ears you’ll feel like someone is trying to drive a knife into your head.
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