Greg - 10/09/2007 7:01 PM
I`ve practiced this before. It can be done, but it IS DANGEROUS. You shouldn`t take more than 3 or 4 breaths...more than that and you`ll pass out from too little oxygen. Also, I`m not sure how well a panicked diver would be able to safely execute this skill. I say just buy a spare air bottle and stay safe.