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Adding O2 is easy. Exhale around your mouth piece and inhale. You get a blast of 21%. Granted there is not an O2 button, but it can be argued it's not needed on this unit WHEN USED AS INTENDED . When the talk goes to hypoxic dil, I agree about needing an O2 add function.

I wasnt there so maybe "shoot" was a poor choise of words. I was quoating what I was told by the person that did the rescue. What ever happened, I'm glad they did exactly what they did.

Yes, and no. If you want a number that represents what you actually are using, yes use your average ATA for that dive. BUT if you want a number that makes you feel good, use your max ATA. If you really want to know how many cubic feet of gas you use per minute per ATA do this ; Note your...

Just out of curiosity (not to start an argument) When do you need it inject 02 with this unit?

If we are talking about an unconscious diver, then I assume the reg is out. In that case a rapid ascent is the only thing that might save his or her life. He or she needs CPR and that can only be done on the ground, and the expanding air in his lungs might just help to push some of the water...

The MAP program (monitor & assesment program) that SSI uses is the reason I choose to train with SSI. Every instructor gets evaluated every so often and offered advice on how to improve the quality of their students. (at least at our shop.) I'm in no way slamming other training organizations...

+1 what Jim said. However in our stress/ rescue class we skip the 2 rescue breathes on the surface and just haul butt to safety. As Jim said its being debated, either way will get you a passing grade with me.

Hi all. This is my first post here on the scubaboard. I am an open water instructor / technical diver that has gone over to the dark side and entered the world of rec rebreathers. I've been diving the MK6 for 3 months now. I love it, However it does need to be used as intended by the designers.