6. Radiant – $320 million
The Radian, owned by billionaire Emirati Abdullah Al Futem, was constructed in 2009. This lavish superyacht offers a range of exciting amenities to keep its guests entertained. On board, you’ll find a jacuzzi, a garage to house a collection of luxury cars, a sauna, a movie theater, and a gym. However, what sets the Radian apart is its rumored defense mechanism—a powerful water cannon. This feature is said to deter any potential pirates who dare to approach the yacht, ensuring the safety and security of its passengers.