breathing easily

I haven't posted on SB in some time but while exercising this morning, thought of an idea to post this to the scuba search and rescue community. So I found this guy, Gilles Essiembre, who has a company out of Canada called O2 Max. He founded the company after "curing" his best friend's...

I finished the pool portion of my SSI Open Diver certification yesterday. I had the less-expensive rental regulator and less fancy BC. I don't know the brands. The reg looked plasticky. I labored to breathe all day. The instructor said he wanted us to be used to both a better regulator...