Travel Today’s the day: Symphony of the Seas, largest cruise ship ever, to be christened in Miami November 15, 2018Gene Sloan, USA TODAYComments Off on Today’s the day: Symphony of the Seas, largest cruise ship ever, to be christened in Miami The new world's largest cruise ship, Royal Caribbean's Symphony of the Seas, will be christened Thursday in Miami by actors Carlos and Alexa PenaVega.