Eric,
So you get to a point where you are effectively "holding your ears open" if you like......
I think I get it now - it makes sense when you say about the constant squealing you get......
I have done this a few times at dolphin, I found it easier to go down with no mask and a noseclip (gives me a heightened awareness of my ears with my eyes closed)
When you concentrate hard you can "pull" the tubes open (thats the best way I can describe it anyway), and you can feel the air going in.....
I can do it more often when spearfishing - don't know why - probably a mindset thing...
When I got it right - sinking from 15 to 30 without having to do anything at all was great, but like I say I only got it right a few times.....makes sense to me now though.....
Steve,
I have some notes from Umberto's course that i'll copy for you that might help you (there are some good exercises in there to strengthen the muscles that help you push air in using your tongue), and heres the link to Erics home page where you can get his frentzel document
www.ericfattah.com (hope thats ok Eric)
hth
