About fifteen years ago, I woke up feeling like hell ALL OVER. Then I realized that I was SERIOUSLY out of breath. I assumed that I must be having an asthma attack that was an order of magnitude worse than I had ever experienced. So I followed the standard advice for asthma attacks: Don’t Panic. Take a deep breath.I took a deep breath, and thought, “Damn, that air is cold and thick”. I started filling my lungs again, and suddenly realized that I was drawing in water, not air. At the point, PANIC! seemed like a good idea.It turned out that I was only a foot and half under water. Somebody had talked me into trying to do a triple front flip from a 3 meter spring board for the first time in my life. I tried to chicken out after 2, but ended up doing 2 1/4 rotations, and slapping the water so hard that I passed out from pain.But there were lessons to be learned.A) When in doubt, make sure that it is air you are about to breathe!B) Filling your lungs with water will not immediately render you unconscious. However, salt water will rip your lungs up pretty hard. SO:If you ever find yourself struggling to get to the surface in FRESH water, DO NOT let the overwhelming need to try to breathe get in the way of your swimming progress. Don’t fight your muscles. Let your lungs draw the water in. This will actually keep you conscious a little bit longer because the CO2 building up in your lungs will have somewhere to go, and you may even get a little bit of O2 out of the water.So a week after that event, I had to get back up on the horse to prove that I wasn’t afraid of it.I did a double gainer (facing forward, rotating backwards). But I came out maybe 15 degrees short, and the wave of water that washed up my chest shot Sunday afternoon public pool water deep into my sinuses. The sinuses got infected. A week later, the infection had moved into my lungs, and I was coughing up puss balls until I got some antibiotics. It was one of those infections where you aren’t really sure whether you are more afraid that the infection might kill you, or more afraid of the idea that it might take a long time to do so.Edit: Complaints that I did not answer the question. But I believe that I provided some valuable and closely related information that I was unaware of before this event: Drowning takes a good bit longer than however long it takes to fill up your lungs with water. So I believe that it can be useful to avoid excess panic over the misconception that the moment you draw in water it is all over.There were comments form people who did not understand my claim that the water may actually help you stay conscious a WEE bit longer. No, I did not claim that one could breathe water. But gasses DO diffuse into and out of water. So filling your lungs with fresh water will allow a tiny amount of CO2 and oxygen exchange. I cannot guess whether the extra time of consciousness provided would be at all significant. But inhaling water will certainly NOT render you unconscious faster in clean, fresh water. It seems logical that holding in the CO2 could though.