Sailing Yacht A -- seen here at the start of its sea testing -- will be one of the world's largest superyachts when it is officially delivered to owner Andrey Melnichenko in 2017.
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The 143-meter vessel is the eighth longest in the world, and its 90-meter-plus carbon masts are all taller than the Statue of Liberty.
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One of its main features is a glass hull which allows guests to view the ocean below. It has been tested at depths of up to 120 meters to ensure it can withstand the necessary water pressure.
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The designer who oversaw the build, Philippe Starck, was also in charge of designing former Apple boss Steve Jobs' yacht Venus.
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Melnichenko commissioned Starck for the project after the French designer delivered his Motor Yacht A boat.
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Testing for Sailing Yacht A took place off the coast of Strande, northern Germany, on October 16.
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Motor Yacht A, which was completed in 2008, cost Melnichenko a reported $300 million. It is pictured moored on London's River Thames in September 2016.
