
The world's largest cruise ship is taking shape in France and getting ready for a bon voyage during its initial trip from Barcelona to Rome in April of 2016 after construction is complete.

Harmony of the Seas, Royal Caribbean's third Oasis-class cruise ship, is being built at the STX France shipyards near St. Nazaire.

The 16-deck ship, which will have seven distinct neighborhoods and carry 5,479 passengers along with 2,394 crew members, received the last of its construction blocks earlier this week.

The Harmony of the Seas seen while being towed by tug boats into the STX France shipyards so work on it could continue

The Harmony of the Seas will have a gross tonnage of 226,000, a length of 1,187 feet and max speed of 23 knots once it is complete

The 16-deck ship will have seven distinct neighborhoods and carry 5,479 passengers along with 2,394 crew members when it is done

A technician looked at two of the cruise liner's propellers

In addition to sailing from Spain and Italy, the boat will also make stops in London and Fort Lauderdale, Florida, in the United States, according to Cruise Critic.

With a gross tonnage of 226,000, a length of 1,187 feet and maximum cruising speed of 23 knots, the Harmony will be the third in Royal Caribbean's Oasis class of ships.

It will be slightly larger and more fuel efficient than its sister ships the Oasis of the Seas and Allure of the Seas.

Once the massive vessel is complete, it will have three multi-story waterslides which will spiral over the Central Park area of the ship ten decks below.

Central Park will have living trees and real grass, the Orlando Sentinel reported.

Josh Martin, the president of an engineering firm that worked with designers on the water park, said: 'This are the first water slides Royal Caribbean has put on a ship.

'So it was very significant, very challenging to just think through how do we integrate those in to what was an existing class of ship and make them feel like they were always meant to be there.'

The Harmony will have the 'fastest internet connection at sea' and contain the Bionic Bar.

At the onboard drinking establishment, robot bartenders will 'serve up one-of-a-kind crafted cocktails while dancing to a fluid beat'.

Michael Bayley, the president and CEO of Royal Caribbean International, said: 'We are orchestrating a medley of new exciting concepts with the best Royal Caribbean innovations to strike the perfect chord for adventurous vacationers.

'That is why we are calling our third Oasis-class ship Harmony of the Seas.'

In addition to 2,747 staterooms and 20 dining options, the Harmony will have two rock-climbing walls, zip lines, an ice skating rink, a full-size basketball court and a miniature golf course.

A fourth Oasis-class vessel which is being constructed at the French is due in 2018.

It has yet to be named.

The Harmony will be larger and more efficient than its sister ships the Oasis of the Seas and Allure of the Seas

Once the vessel is complete, it will have three multi-story waterslides twisting and turning over the Central Park area of the ship

In addition to 2,747 staterooms and 20 dining options, the Harmony will have rock-climbing walls. Its last block is now in place (above)

At the ship's Bionic Bar, robot bartenders will 'serve up one-of-a-kind crafted cocktails while dancing to a fluid beat'