World's biggest cruise ship finally completed after 2 years

Chairman and CEO of Royal Caribbean, owners of Harmony of the Seas, Richard Fain joined the ship's incoming crew at the STX shipyard in St Nazaire, France for a traditional flag changing ceremony atop the 227,000-ton vessel.

The flags of France and STX were lowered and the US and Royal Caribbean flags were raised during the ceremony, while the flag of the Bahamas, where the ship will be registered, also was raised.

Harmony of the Seas is expected to hold nearly 100 more passengers at double occupancy, and it's total capacity will be well over 6,000 people, not including crew.

The ship which is designed for vacationers who love big, bustling mega-resorts, features a giant, multi-deck water slide area; a first for Royal Caribbean and has a Bionic Bar where the drinks are served by robot bartenders.

Other distinct features of the giant ship include a private suites-only restaurant and a full-service Suite Sun Zone sun deck.

According to USA Today, Harmony's first voyage with paying passengers is scheduled for May 22, and after an initial series of cruises in the Mediterranean, it will re-position to Fort Lauderdale, Florida, to offer alternating, seven-night Eastern and Western Caribbean voyages.