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Specialties no, adventure dives yes. Deep and Wreck specialties are courses including skills that one can't learn on a single dive (limited penetration techniques, deep diving physiology and emergecy deco etc). The dives you do during AOWD can, however, count toward specialty course dives, such...

The quick & dirty solution would be simply printing whatever you want to print on a regular paper and then laminating it. While they might not take so much abuse (they don't like being bent too much), it would work.

Have there been actual double-blind studies about this? They would be interesting to see.

Could you show us the study in question? If one uses Nitrox with air NDL's, isn't it pretty obvious that the risk of DCS is smaller since one's tissues absorb less nitrogen this way?

Having done my PADI Enriched Air a month ago, I started wondering, are there any actual differences between what is taught in the entry-level Nitrox-certifications between the agencies?