It's the engines that make the Riva Aquarama a real Lamborghini.
The boat uses a pair of V12s from the 350 GT, the first production vehicle produced by Lamborghini. These 60 degree aluminium V12 DOHC engines were designed by Giotto Bizzarrini in 1963. In addition, Ferruccio Lamborghini was directly involved in their conversion for boat use. The bore and stroke were changed to give it more low-end torque, plus each engine rotated in different directions to offset each other. Furthermore, the engine output is over the top in true Lamborghini style. A combined total of 700 hp is generated at only 1,500 rpm.