One of the richest men on earth, Bill Gates has ordered the first-ever hydrogen fuel cell-based yacht, the Sinot’s Aqua. The “Superyacht” costs $644 million, and is powered by two 1MW motors fuelled by supercooled hydrogen tanks. It has a 17-knot top speed (19.6MPH), it is capable of cross-ocean travel due to its 3,750-mile range.