Subs are pretty expensive. Even if we got one, who could sail it? Plus, the cost of diesel would make a trip very expensive. It would be an interesting way to change sea travel though. The Coli Submarine Cruise Line.
Leave from NY, go to Miami, loop around to Cancun, pick up some Cuban baseball players with MLB aspirations, return to the Dominican Republic, party, zip back around to Baltimore to sign contracts with the Orioles or whoever. Make cash money.