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On my last trip to Cozumel, I tested every tank for CO - but not O2, until I saw 2 divers mistakenly put on 36% Nitrox for a deep dive rather than the late shallow dive as planned. Now I will test all tanks for both.As well as CO and other contaminates what if she got a EAN blend in her tank and Did not know about it? some of the problems the divers felt were like what you might see before CNS convulsions.
We probably never will see proof of what was in these tanks. If I am ever on a boat with an accident again, I fully intend on testing the used tank then and there so as to aid in the immediate treatment of an injured diver. The way things are often covered up, there might be opposition - but I will try, and I will post names of anyone who gets in my way.
More and more divers are getting the word that testing is important. We can only hope it becomes mainstream.