Photo: Léandre Loyseau / SuperYacht TimesSpotted yesterday cruising off Antibes on the French Riviera, is the 73.3-metre superyacht Nautilus. Previously named Grace E, the 1,876 GT superyacht was launched in 2014 by the Viareggio-based shipyard Perini Navi as the largest motor yacht in their fleet. Engineered and built for global cruising, the explorer-type vessel is the design work of Philippe Briand and French studio Rémi Tessier is behind the original interior design. Powered by two Caterpillar diesel-electric engines, Nautilus can reach a top speed of 16.5 knots, a cruising speed of 12 knots and has a transatlantic range of 7,500 miles.