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PADI used to require either a night or limited vis dive for AOW - there were no dive electives. (I think that was a good thing to make sure people were exposed to, it's good experience and even diving in normally clear waters you could find youself in an unexpected limited vis situation.)solo_diver:I find this very hard to believe. Why would a certification agency require a night dive anyway? Padi doesn't even require a night dive for the so-called advanced card.