It might have something to do with fresh water and slightly "yoyo" profiles. I never experienced any sinus problems in almost 300 dives before I started cave diving. Then I got a full cave cert this November in Florida. During our first post-certification dive (of course!), I got a very uncomfortable reverse blockage in my sinuses when we were going up Bone Tunnel in Ginnie. I didn't know about the "upside-down" trick, so I just turned the dive and hung around a while when it became noticeable again during exit.
My sinuses were completely clear before and after, and I did not even remotely have a cold or any other condition that might have been the cause...
P.S.: My first post here! Hi all!


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