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I'm thinking of doing Nitrox, night diving and wreck diving besides the required Deep and UW Nav for AOW. I don't think I want to do dry suit right now since I don't have plans to don a dry suit at this time.
My questions are: for the PADI Nitrox course are checkout dives required? I can't seem to get a clear answer to this. Does the wreck diving course involve penetration, if so that makes it non-OW right? Are there any additional risks to doing this course?