Building a Lego powered Submarine 2. 0 magnetic couplings

This RC sub has magnetic couplings to transmit torque through the walls. No need to drill holes no leaks. At the end I test it in a swimming pool. Enjoy Differences to the first sub rectangular hull (need flat walls for magnetic couplings) snapandlock lid (more reliable, less leakage) bigger motors, more motors, more propellers depth control using propellers (IMO more accurate compared to a syringe ballast tank) lead pellets for ballast (easier to adjus