Oasis of the Seas is also 8.5 metres (28 ft) wider, and with a gross tonnage of 225,282, is around 70,000 tones larger.

Common to all ships are Entertainment Place, Central Park, Boardwalk and Royal Promenade.

[19] To keep the ship stable without increasing the draft excessively, the designers created a wide hull.

Propulsion is provided by three 20,000 kW (26,800 hp) Azipods, ABB's brand of electric azimuth thrusters.

[16] The second generation introduced new bars and restaurants from the first-generation Quantum class, the Ultimate Abyss dry slide, a new waterpark and an Escape Room.

[27] The oasis class of ships is currently made up of 6 vessels, with the most recent addition, Utopia of the seas, joining the fleet in July 2024.

Oasis of the Seas, the first vessel of the class, was ordered in February 2006 and designed under the name "Project Genesis".

[48] While exiting the Baltic Sea, the vessel passed underneath the Great Belt Fixed Link in Denmark in October 2009.

The passage under the bridge was possible due to retraction of the telescoping funnels, and an additional 30 cm (12 in) was gained by the squat effect where vessels traveling at speed in a shallow channel are drawn deeper into the water.

[49] Proceeding through the English Channel, Oasis of the Seas stopped briefly in the Solent so that 300 shipyard workers who were on board doing finishing work could disembark.

[52] The ship arrived there on 13 November 2009, where tropical plants were installed prior to some introductory trips and her maiden voyage on 5 December 2009.

While media has reported that there was only 30 centimetres (12 in) of clearance, the mean water level was closer to 2–3 metres (6.6–9.8 ft).

[57] Royal Caribbean confirmed in October 2012 that they were engaged in negotiations to build the third Oasis-class ship, which became Harmony of the Seas.

[64][65] The ship features an expanded adults-only solarium area and three water slides, a first for Royal Caribbean.

[68] In May 2014, Royal Caribbean exercised their option for a fourth Oasis-class ship, which became Symphony of the Seas.

[75][76] In February 2019, Royal Caribbean Cruises Ltd. ordered a sixth Oasis-class ship,[77] named Utopia of the Seas.

[79][80] In February 2024, Royal Caribbean and Chantiers de l'Atlantique announced that they signed an agreement for a seventh Oasis Class ship to be delivered in 2028.