The world's first hydrogen gas fuel-cell superyacht, long rumored to have been commissioned by billionaire founder , is now officially for sale.Dubbed Project 821, the 390-foot (119-meter) superyacht is designed to run on 'green' hydrogen — although to be stored as a liquid, the gas must be cryogenically stored at -423.4 degrees Fahrenheit in painstakingly designed, double-walled tanks. shipbuilder Feadship said the launch of this approximately $646 million vessel on May 4th at their Amsterdam shipyard sees the yachting world 'forever changed.'
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