Stunning $15 million superyacht unveiled in China The luxury $15 million (£9 million) trimaran Adastra, built for Hong Kong couple Anto and Elaine Marden, turned heads at its launching ceremony yesterday. Weighing in at 52 tons, the vessel has a range of 4000 nautical miles at 17 knots - enough for a trip from the UK to New York. Maximum speed is 22.5 knots. It has been described as "one of the world's most amazing super yachts, that could spell the future for efficient long range cruising." Hi-tech features include being able to be controlled from an iPad within a 50-metre range. The boat is 42.5 metres long and 16 metres wide. Designed by West Sussex-based John Shuttleworth Yacht Designs, it was built by McConaghy Boats in Zhu Ha, China. It has space for nine guests and between five and six crew, and features a lounge as well as bar and dining area. The boat's superstructure is built from carbon fibre with a honeycomb core, with a hull made from glass and kevlar, and oak interiors.