Cruise line Royal Caribbean has confirmed it has signed an agreement for two new vessels with German shipyard Meyer Werft.

The pair – to be delivered in 2014 and 2015 respectively – are believed to be the first in a series of cruise ships featuring a wholly new design for the operator.

Each will carry approximately 4,100 passengers. However, further details are the venture – codenamed ‘Project Sunshine’ - are being kept “under wraps” until closer to launch.

Royal Caribbean chairman and chief executive Richard Fain said: “I can say I am very excited about the passion and imagination that our teams have devoted to the project

“Project Sunshine builds on the best ideas of our existing ships and adds exciting new activities and entertainment concepts.

“It will offer features for everyone: from grand, spectacular spaces to small intimate settings; from invigorating activities to the serenity of more personal space; and from a plethora of dining alternatives to a cornucopia of opportunities for families.”

He added that the new vessel would also incorporate energy efficiency and environmental technologies.

“Our existing ships are some of the most energy-efficient in the world, and Project Sunshine takes this one further step,” he added.

Each ship is believed to carry a price tag of $350 million.