Attached Link: http://www.uscg.mil/datasheet/110wpb.htm

Ia patrol boat is about 110 feet long and about 20 feet beam (see this link ), what is its likely height from the keel to the main deck? In Red Sea scuba diving liveaboards about the same length, there is room below the main deck for a lower deck of passenger cabins and storerooms, and below that for the engine room.