TUI Cruises, a German line owned jointly by Royal Caribbean Cruises Ltd. and TUI Group, has ordered two ships from the Meyer Werft shipyard in Turku, Finland.

The ships are scheduled to be delivered in 2018 and 2019 and will replace ships that previously sailed for Royal Caribbean and now sail for TUI as Mein Schiff 1 and 2. Those vessels, in turn, will be passed onto the U.K. market’s Thomson Cruises, another brand in the TUI Group.

After the newbuilds start sailing for TUI Cruises, it will have six modern ships in its fleet. TUI did not specify the size or cost of the new vessels.

In May, TUI took delivery of Mein Schiff 4, a 100,000-gross-ton ship designed for 2,790 passengers.