where will the air in sinus and etube go on the way up

[Kray]

since we constantly fill those cavity on the way down, on the way up the air expand, do they go back to the lung themselves ? because our head is above the lung it should not be possible.

I'm asking because I spent the whole month doing depth. I had no problem equalizing all the way down, but on some rare occasions, when I came up about 3-4 meter to the surface, my right ear hurt. It did not feel like ear drum but something else. I guess, when my ear was less than perfect, some air was trapped in a small cavity and it expanded too quick to escape causing a little pain.

So what's your advice on ascend ? I dive with noseclip from times to times. I made sure the soft palate is in neutral, so the air shall expand back to my mouth. What else should I know of ? maybe coming up slower on the last 10m ?

 

[Peter123]

I think its pretty easy. When you watch a diver with a mask during ascend there will be little air bubbles coming out. If not the diver is sucking air through his nose in his lungs. Same with noseclip. If I dive with a noseclip I have either to virtualy breath in through my nose during ascend or I need to remove the noseclip. If not my eardrum will hurt!!

 

[Kray]

you maybe right, I never sniff air back when using noseclip, only do it with mask. I thought leaving soft palate in neutral is enough. Yeah it's enough for most of the time, sniffing should make it better.