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A superyacht powered entirely by liquid hydrogen and fuel cell technology - meaning its only emission is water - has been revealed at the Monaco Yacht Show.
The 367-foot vessel known as Aqua, designed by Dutch company Sinot, has a top speed of 17 knots and a range of 3750 nautical miles, putting it on a par with other superyachts.
Its futuristic design is inspired by the ocean, with a curved top deck and sculpted hull, intersected by a band of floor-to-ceiling windows.
Inside, accommodation is spread over five decks, which are connected by a spectacular spiral staircase at the centre.
As well as luxury cabins for 14 guests and 31 crew members - including a huge "owner's pavilion" - the yacht features a gym, yoga studio, hydro massage room, cinema and cascading pool on its rear deck.