What part did Rolls-Royce Holdings make for Sea Jet?
Sea Jet:  Among the first technologies tested was an underwater discharge water jet from Rolls-Royce Naval Marine, Inc., called AWJ-21, a propulsion concept with the goals of providing increased propulsive efficiency, reduced acoustic signature, and improved maneuverability over previous Destroyer Class combatants. Rolls-Royce Holdings: Rolls-Royce Holdings plc is a British multinational public limited company incorporated in February 2011 that owns Rolls-Royce, a business established in 1904 and today designs, manufactures and distributes power systems for aviation and other industries.
an underwater discharge water jet