Not to be confused with the Battleship Yamato. Yamato 1 is the first magnetohydrodynamic drives (MHDDs) watercraft. It was built in the 1990s. Magnetohydrodynamic drives use electrics and magnetic field to propel.
Yamato 1 - Wikipedia
The 100-Knot Superboat That Never Was | MHD Drive Unit
They could make good modeling project.