Semi-Sub in Caribbean

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While on a Caribbean cruise a few years ago, we went into what I called a semi-submarine. We went 'downstairs' in the boat, below deck where we could look straight ahead and down at fish below the water. From time to time, members of the boat's crew would throw fish food into the water, and the fish would be excited by this activity. We had a great time and really enjoyed seeing various tropical fish while on this mini-cruise.