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Don´t rush to the chapel just yet, haha! Although you cannot work in Galapagos, often times you can go along on the Dives and be paired up with the "odd diver out", or just follow up the group at the back. You cannot lead the group on your own, or lead the group at all without the required work permits as well as National Park permits and Galapagos marine reserve permits! I haven´t had the fortune to dive at the other places mentioned here, but I can tell you: doing my DM course in Galapagos helped me to learn quite quickly: i encountered lots of situations where I needed to help out others, make decisions, and help in briefing translations upon occasion! (I even found myself at 15 meters with a blown off mask, which wasn´t much fun...but it did make me a better diver, in my opinion).
Good luck with your decisions,and no doubt you are bound to have a great time no matter what!
Just wondering if anyone ever wrote back to you. Currently, SubAqua has been suspended from operations after an accident in July. RM does not have an instructor on staff though could farm it out. I would stick with Scuba Iguana for now. One of only 2 Course Directors in Ecuador does live in Galapagos, but travels often, so timing would be the issue with her.