In a shipyard in Germany, Blohm & Voss workers are building a mammoth yacht called the Eclipse.
Like many things in the secretive world of superyachts, its exact length is hard to pin down. So is the name of its owner, and the cost of building it.
But according to the Web site of The Yacht Report, one of several publications that track yachting with the same intensity that gossip magazines cover Hollywood hunks, the Eclipse is 531.5 feet long.
That's six and a half feet longer than the Dubai, an 11,600-ton behemoth that now holds the record as the world's largest yacht. Its owner is the ruler of Dubai, Sheik Mohammed bin Rashid al-Maktoum.
The extra length on the Eclipse isn't an accident. Supersized yachts are the latest examples of one-upmanship among billionaires, many of whom already own a private jet, a Rolls-Royce or two, and multiple mansions.
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Scroll down for photos of some of the world's largest yachts.
Photos via the New York Times.