Yes in these conditions you should have you own independant alternate air source.
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rhyz:I talked with my instructors and asked them when I could take my AOW seeing as I'm headed to the caribbean for a week in Sept and also Oct. They basically told me to take the AOW before I left. Which I decided would be a good idea, plus I love diving so it works out. Also taking a Nitrox class to incase. After this wreck dive I see I'm going to have to do the pony bottles, (didn't dive with one this time) seeing as any dive over 80 (I think) requires one unless your with a DM or Instructor. But I'd rather have my own. Taking the classes seems like a good idea because I cant learn more as I dive and work on my skills. I'm going to be diving anyway. hopefully I can get a couple more trips to Dutch and practice more in freshwater also. But the feeling I get when I'm underwater I just can't shake.....
Edit: The wreck and the night dive I just signed up for because they were the ones that were available to go on with my LDS. They weren't part of my AOW course at the moment. Just more dives I could do. Till I get to meet more people I will dive with the LDS and my Instructor and DM there as I'm very comfortable with them.