Unless you were in the military, it's not likely you ever had a chance to go on a submarine. For those who don't have problems with confined space, this tour may be a once in a lifetime opportunity. You get on a shuttle and head out to the sub. You get into the sub, and next thing you know you are underwater and looking at all kinds of marine life. It really is worth doing, especially if you don't snorkel or scuba.
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