Multi-billionaire Bill Gates has not commissioned an eco-friendly luxury superyacht that’s powered entirely by liquid hydrogen, the boat’s creators insist.

First unveiled at last autumn’s Monaco Yacht Show, the futuristic Aqua is a 370ft, five-deck mega-yacht with room for 14 guests and more than twice as many crew.

As it would be powered from two massive vacuum-sealed tanks of liquid hydrogen, its only emissions will be water.

Designer Sander Sinot says he hopes the Aqua concept will push the industry towards a more ecological future.

But his company rubbished reports that the vessel had been sold to the Microsoft tech magnate — although its eye-watering $645 million price tag would be pocket change to the 64-year-old, who is the world’s second richest man.