It's not for the claustrophic, but Atlantis Submarines offers a different knd of tour. It's a one of a kind experience that is coupled with education. First you get on a shuttle and head for the sub. Then you board the sub, Down you go, where you can see the fish, sharks, and ocean inhabitants that are invisbile from shore.
If you don't scuba or snorkel, this will open your eyes.
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