us coast guard us naval academy and most eastern seaboard states have excellent courses in maritime science
Not sure what you're looking for specifically, but i am starting Commercial Diving Acadamy in Jacksonville, fl this sept for commercial diving air/mixed gas program. It's a trade school. Look them up. They may be what you're looking for.
Maine has one of the best..Maine Maritime Academy
East Coast in the states about 9 hours from NYC http://www.mainemaritime.edu/