The term superyacht refers to crewed yachts, ranging from 40 meters to more than 180 meters in length. A superyacht with over 90 meters is called a gigayacht, only a half-dozen of them launch every year. The Financial Times published an interesting article calling superyachts a terrible asset. They need permanent maintenance. Saltwater is a harsh environment. Only with constant maintenance and repair, you can keep a vessel alive.