Harmony of the Seas The Harmony of the Seas is Royal Caribbean’s 3th Oasis -class luxury cruise vessel and at the moment it is the world’s largest cruise vessel. Her sea trials began on the 10th of March, 2016 and her maiden voyage was on the 15th of May, 2016. Case Harmony of the Seas Expertise Engineering Luxury Cruise Vessel Oasis -class Client: Royal Caribbean Cruises Ltd. - Miami/Turku Shipyard: STX France - Saint-Nazaire Technical information of the vessel: Length: 362.1 m Breadth: 66 m Draught: 9.14 m Gross tonnage: 227 000 Passengers: 5400 Crew: 2400 Speed: 23 knots Etteplan was commissioned to assist the shipyard to secure the strength of the structures and vibration behavior in the new project. The new improvements and modifications brought challenges that needed to be solved. The know-how and experience from the previous vessels helped in the design process. Etteplan has also helped the RCCL design teams with strength and vibration of the steel hull. The commission included the hull classification documentation and FE analysis approval.