of the ship fabricated in bronze inspired by the Art Deco mural in the main dining room of the original Queen Mary. The 10th Deck Pavillion features a glass ellipse sculpture by Tomasz Urbanowicz called "Blue Sun Setting in the Ocean". Technical aspects Power plant and propulsion systemQueen Mary 2s power plant comprises four sixteen-cylinder Wärtsilä 16V46CR EnviroEngine marine diesel engines, generating a combined at 514 rpm, and two General Electric LM2500+ gas turbines, provide a further ; these drive electric generators, which in turn provide the power to drive four Alstom electrical motors located inside the podded propulsors (and thus entirely outside the vessel's hull). Such an arrangement, known as integrated electric propulsion (IEP), provides for economical cruising at low speed combined with an ability to sustain much higher speeds when required, and has been common in naval vessels for several decades. The propulsors are Rolls-Royce Mermaid azimuth thruster type podded propulsion units, each with one forward-facing low-vibration propeller with separately bolted blades. The forward pair of thrusters is fixed, but the aft pair can swivel through 360°, removing the need for a rudder. Queen Mary 2 is the first quadruple-propeller passenger ship completed since the SS France in 1961. Queen Mary 2 carries eight spare blades on the foredeck, immediately forward of the bridge screen. In addition to the primary thrusters, the ship is also fitted with three bow thrusters, with a power output of 3.2 MW each. These allow the ship to turn in its own length while in port, to conduct more complex docking manoeuvres. Unusually, Queen Mary 2s gas turbines are not housed along with her diesels in the engine room deep in her hull, but instead are in a soundproofed enclosure directly beneath the funnel. This arrangement allowed the vessel's designers to supply the oxygen-hungry turbines with air intakes without having to run air ducts the height of the ship, which would have wasted valuable interior space. Navigation Queen Mary 2 has a fully integrated bridge system designed by British firm Kelvin Hughes, which controls the ship's navigation systems, radar, dynamic positioning system, and engine monitoring system. Kelvin Hughes supplied many of the ship's components, including the Electronic Chart Display and Information System (ECDIS) and eight multifunction display units. Water supply Fresh water aboard Queen Mary 2 is supplied by three seawater desalination plants. The plants, each with a capacity of per day, use