The latest generation of UT 700 series is "unlike anything seen before", it says - designed for subsea tasks including top hole drilling, construction and inspection, plus maintenance and repair work in deep waters.
"It can also be adapted to undertake light well intervention," RR said.
The vessel is scheduled for delivery in 2017 and will be built by Kawasaki Heavy Industries in Japan.
RR will supply key technology including the propulsion system with six generator sets and seven electrically run thrusters, control and automation systems, mooring and anchoring deck machinery and electric systems.
"This new design is based on many years of operating experience, especially from the vessel Island Wellserver, which we designed in 2005," Rolls Royce offshore president John Knudsen said.
"The UT 777 will be unlike anything seen before, and marks the latest chapter in the story of the Rolls-Royce UT design vessels, which have been pioneering oil and gas exploration for the past 40 years."
"We are excited about building another game-changer in the offshore market," Island Offshore CEO Havard Ulstein said.
