The first block of Royal Caribbean's fourth Oasis class cruise ship arrived over the weekend at STX France shipyard in Saint-Nazaire, France.

The block is just one part of the overall structure of the ship. It and other blocks will be put together later to form the ship. Royal Caribbean has not announced a name yet for the ship.  The first steel cutting occured in February 2015.

The fourth Oasis class ship will debut in mid-2018.

Royal Caribbean's fourth Oasis-class cruise ship took a major step forward today when it had its steel cutting ceremony earlier today at STX France in Saint-Nazaire, France.

The steel cutting marks the official start of construction for any cruise ship.  Royal Caribbean promises more details about this and sister third Oasis-class ship will be reveleaed in the coming months.

The unnamed Oasis-class ship will debut in mid-2018 but it's just one of a few Royal Caribbean ships under construction.  Anthem of the Seas is almost complete and will be ready for an April 2015 launch, followed by a third Oasis-class and Ovation of the Seas (Quantum-class), which will both debut in spring 2016.  

During the keel-laying ceremony for the third Oasis-class ship at STX in St. Nazaire, France, Royal Caribbean announced that a fourth Oasis-class ship is planned. The keel laying, during which a 1,000-ton block was lifted by crane into the building dock, marks the beginning of the physical construction of Oasis III.

Royal Caribbean announced today it has ordered a fourth Oasis-class cruise ship to be built at STX France that will be ready in 2018.

Royal Caribbean chairman Richard Fain made the announcement today at the keel-laying ceremony for the third Oasis-class ship in STX shipyard in Saint-Nazaire, France.

The order of a fourth ship in the Oasis class is subject to documentation and satisfaction of financing and other customary conditions. Projected capital expenditures for 2014, 2015, 2016, 2017 and 2018 are $1.4 billion, $1.4 billion, $2.2 billion, $0.3 billion and $1.5 billion, respectively, taking into account this order and existing ship orders.

“The Oasis Class was a revolution in maritime design when it was launched in 2009. Oasis of the Seas and Allure of the Seas continue to be in a class by themselves both in terms of guest satisfaction and financial returns. Today’s announcement is a reflection of their success,” said Richard D. Fain, chairman and chief executive officer, Royal Caribbean Cruises Ltd. “We are thrilled to announce the order of a fourth Oasis-class ship during the keel-laying milestone of the third. This announcement is also a testament to the men and women of STX France who have worked so hard and so cooperatively on Oasis III.”

The third Oasis-class ship is also being built in Saint-Nazaire, France. It is scheduled for delivery in mid-2016.

Royal Caribbean could still decide to build a fourth Oasis-class cruise ship that would be ready by 2018.

Cruise Currents is reporting that UBS Investment Research says Royal Caribbean is deciding if they want to exercise the option to build a fourth Oasis-class class ship.  The decision to go ahead or not needs to be made by mid-2014.  

If Royal Caribbean picks up the option, then the ship would be deployed by 2018.

Royal Caribbean already has an active order for a third Oasis-class cruise ship that is due for delivery in mid-2016.

Royal Caribbean placed an order for its third Oasis-class cruise ship late last year and will have the steel cutting for that ship occur on September 22, 2013 at STX France.

Cruise Industry News posted an article that cites supplier reports, a fourth Oasis-class ship will be confirmed by next summer, followed by an order for a fifth Oasis-class ship.

There's been an option for Royal Caribbean to build a fourth Oasis-class ship ever since they signed their contract with STX France for the third ship last year.  If Royal Caribbean exercises their option for a fourth ship, it would be ready for delivery by mid-2018.

For a fifth Oasis-class ship, Royal Caribbean has up to four days prior to the one year anniversary date of the signing for the fourth Oasis-class ship contract.

Last December, Royal Caribbean made headlines when it ordered a third Oasis-class cruise ship and then went on to order 3 Quantum-class cruise ships.  It turns out Royal Caribbean might not be done ordering new cruise ships.

UBS Investment Research cruise industry financial analyst Robin Farley says Royal Caribbean currently has an option for a fourth Oasis-class order.  If ordered, that fourth Oasis-class ship would be delivered in mid-2018.

Royal Caribbean must decide relatively soon, as the option for the fourth Oasis-class ship expires in December.

Farley feels lower prices to build new ships, thanks to lack of new ship builds recently, are what may compel Royal Caribbean to consider yet another new cruise ship order.