Conceived by Sussex-based boat designer John Shuttleworth, the Adastra Superyacht is a stunning $15 million vessel measuring 139.5 feet long and weighing 52 tons. It has a top speed of 22.5 knots can travel 4,000 nautical miles without refueling. Fuel efficiency is helped by a lightweight hull, made of glass and Kevlar, as well as an interior appointed with similarly lightweight oak cabinetry with honeycomb panels. Billed as the second largest of its kind, the trimaran took four years to build and features an integrated ship monitoring system, allowing it to be be controlled by an iPad 50 meters away. Commissioned by Hong Kong-based shipping magnate Anto Marden, the luxury yacht can house up to nine guests and six crew members. Creature comforts include a full-width master cabin and two guest cabins — all appointed with luxury bathrooms — as well as a sauna, whirlpool and fully functional kitchen. Finally, a spacious deck saloon offers panoramic views. Check out more looks in the gallery below.