Many underwater vehicles still use propellers to move their vehicle. The disadvantage of the traditional propeller is that it produces noise and vibration. Nowadays, with the technology that has been invented and improved, there is another way to move the underwater vehicle besides using the propeller which is the use of a magnetohydrodynamic (MHD) thruster. Additionally, the design reduces wear and friction throughout the drivetrain. When vibration and noise are reduced, it enhances passenger comfort. The magnetohydrodynamic thruster that is built in this paper is an open rectangular pipe that has aluminum electrodes attached to the wall of the pipe and neodymium magnets. As this experiment is for underwater vehicles, a salt solution was used to represent the seawater. A permanent magnet supplies the magnetic field in this circuit, and an electrode creates the flow's electric field. Fluid conductors travel throughout the circuit as a result of magnetohydrodynamic processes, the salt water exposed to the magnetic field and electric current. The cross product of a voltage supplied and the magnetic field applied by the permanent magnet produces the electromagnetic force. The main parameters of this experiment are magnetic strength, voltage, sound level, and volume of flow rate. The water flow rate is then measured in terms of volume. A comparison between conventional and MHD thruster is to validate that the MHD thruster can reduce noise and vibration. It was found that the MHD thruster is more reliable compared with the conventional thruster. Nevertheless, there are still more works to do, to make the MHD thruster better.