Finnish shipbuilder Aker Yards will build the ship, estimated cost $1.25 billion (£715 million) for an Autumn 2009 delivery, continuing a 35-year collaboration with Royal Caribbean.

At 1,180 feet long, 154 feet wide and 240 feet high, Project Genesis will give Royal Caribbean ample room to create memorable new icons and amenities to heighten guests' cruise experience.

Energy efficiency also was prioritised in the new design with significant modifications made in the form of the hull and in the air conditioning and water production and treatment systems.

Said Royal Caribbean chairman Richard Fain:

"It is exhilarating to take such a giant step into the future. Project Genesis truly is a remarkable ship. Its bold design, daring innovations and technological advancements will delight our existing cruisers and help us draw in new ones."

Yrjo Julin, president of Aker Yards Cruise and Ferries, is equally proud of the companies' work.

"After developing so many generations of cruise ships together, we are excited about jumping so far out in front of cruise-ship design with this highly innovative and exciting ship," Julin said. "Working together, we will create an unparalleled experience for the next generation of cruisers."

Julin estimates Project Genesis will take 5,800 man years to complete. Aker Yards has delivered 11 ships to Royal Caribbean over the last four decades. Three of the brandÕs newbuilds are now under construction at the yard. The first out is Freedom of the Seas, which debuts in June.