By boat you are taken to where the submarine has surfaced. The people from the previous trip and you switch places. The hatches are closed as you go down to depth of 100+ feet along the reef of the island seeing all sorts of life under the sea. Everyone has a window to see out of and the crew narrates what you are looking at. 28 people fit in the sub sitting back to back in a row of seats down the middle. We did the day ride and then 2 days later the night ride where you see predators in action. Although pricey, it is something you should do at least once in your life. If you are claustrophobic, stay with the glass bottom boats.
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