While the world's largest cruise ship was only unveiled at PortMiami about a year ago, Royal Caribbean's Symphony of the Seas, construction of the newest, soon-to-be largest cruise ship is already underway. The Wonder of the Seas is set for delivery in 2021, where deployment to Asia will commence immediately with itineraries from China. The video obviously features elements of renderings, artistic impressions, and footage featuring other Oasis Class ships. Doesn't matter! It looks great and should prove a very unique way to dive deep among some of the futuristic-looking cities of China's coasts.