Good thread Don.
Do you plan on diving while your sinsus are flooded? I would acutally like to try this but I think it would only help me for depts over 30m. At that point I do a mouth fill and freznel as BTV stops working. I would still like to try it though.
Eric, once again my friend you never fail to amaze me with the wacky but useful info.
Very cool.
