I would wager this happens more often than we think. It's a nice way to get into the U.S..
We had a guide in China who told us that she would love to see the inside of such a beautiful ship. (Statendam) She also admitted that she would also love to stowaway and go back to the U.S. with us but would never do it because of the problems it would cause for her family.
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"There is a great difference between being well traveled and just having been to many places." ~Me