@V_ Looks like a fun project! Guessing this was meant to be a propeller boat? Did you have an enclosure to keep the motors away from water?
@sp correct! No, we did not create an enclosure for it. I just chanced it with the motors and the water. The bigger issue was that the motors were not strong enough for the cable. I then removed the cable and put the batteries directly on the boat. But then it was too heavy.