• The ‘Aqua’ superyacht powered by liquid hydrogen - a snip at £500m. It can travel 3,750 miles before it needs to refuel. Photograph: Sinot/Cover Images.
    The ‘Aqua’ superyacht powered by liquid hydrogen - a snip at £500m. It can travel 3,750 miles before it needs to refuel. Photograph: Sinot/Cover Images.
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Bill Gates has ordered the world’s first hydrogen-powered superyacht, worth an estimated £500m ($644m) and featuring an infinity pool, helipad, spa and gym.

The billionaire co-founder of Microsoft has commissioned the Aqua ship – a 112-metre (370ft) luxury vessel completely powered by liquid hydrogen – which was publicised last year at the Monaco yacht show by the Dutch design firm Sinot.

Speaking about the project last year, the marine designer Sander Sinot said: “For the development of Aqua we took inspiration from the lifestyle of a discerning, forward-looking owner, the fluid versatility of water and cutting-edge technology, to combine this in a superyacht with truly innovative features.”

The boat has five decks and space to accommodate 14 guests and 31 crew members. In a further environmentally friendly feature, gel-fuelled fire bowls allow guests to stay warm outside without having to burn wood or coals.

But its most cutting-edge feature is tucked away below decks - two 28-tonne vacuum-sealed tanks that are cooled to -423F (-253C) and filled with liquid hydrogen, which powers the ship. The fuel will generate power for the two one-megawatt motors and propellors via on-board fuel cells, which combine hydrogen with oxygen to produce electricity. Water is a byproduct.

The vessel is unlikely to take to the seas before 2024, according to the Sunday Telegraph, which reported the Gates commission. When it does, it has the potential to reach speeds of 17 knots (about 20mph) and travel 3,750 miles (or roughly London to New York) before it needs to refuel. The Sunday Telegraph said the boat would have a “diesel back-up” due to the scarcity of hydrogen refuelling stations.

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