AquaDuck Preview on Disney Dream

http://www.wdwinfo.com/disney-cruise-line/dream-ship.htm From Disney: A shipboard water coaster that stretches 765 feet, and spans 4 decks. Water blasters propel guests around the perimeter of the ship and includes a "swing out" loop extending over the side of the ship. Guests in the clear tube will be able to see all the way to the ocean's surface 150 feet below.