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Not sure which one you are talking about or where.... but we did the Atlantis Sub in Grand Cayman. Im glad we did it once, but I dont think I would do it again. It was kinda pricey for 4 people, and we really didnt see much more than we saw when we took a glass bottom boat tour. But it was kinda neat for my kids to actually get to go underwater in a submarine. I also booked with them directly instead of doing the ships tour, less $$. You can find them online.