I think they made two courses out of the original tech nitrox - the new advanced and technical. There is no difference in the physical principles taught in either of these courses, and thus no reason to restrict certain mixes such as O2 to either one course or the other. IMO, it's just another attempt at the "PADIization" of IANTD. Anyone think that PADI will buy out IANTD someday, now that BSAC has nitrox (and other agencies probably will soon)? ;-) Christina
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