Took the Atlantis Sub ride in Cozumel summer before last with my teenage daughter. We were very disappointed because we saw very few fish, no turtles or anything amazing. The only thing we saw different from snorkeling, was larger coral, but it was not colorful. The sub windows are positioned so that you have to sit in a cramped space and bend down to see out. Your neck and back are hurting alot by the time you get out. I am going to GC next month on the Rhapsody and plan on trying the Stingray tour.