NAUI Tec also allows cavern in doubles (that's the only way I will teach it now).
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Four of us did our Cavern and Intro with doubles through TDI & NACD. GDI was the instructor. Great classes and training. It definitely prepared us for Apprentice and Full.
("very comfortable" Toorish? I'm not sure many would describe carrying 120's out of Challenge comfortable--but then again that was Full, not Cavern)
Bryan B
For Cavern, they (PADI) do not allow doubles. I just took the PADI Cavern in May, and that was pointed out to me specifically by the instructor (who was also my Tec instructor, and with whom I usually dive doubles).Rainer:Ok, so it sounds like ALL agencies will let you do it in doubles (well, no one mentioned if PADI allows doubles; I think I read they don't).