Waterproof single-conductor connection system

Connection system that provides robust, waterproof, high current capacity connections between cables and devices. Cables each contain a single conductive wire that terminates in a threaded rod. The threaded rod screws into a corresponding threaded hole in a receiving socket. Engagement of the threads provides a large contact surface area to support high current capacity and to provide a strong holding force to secure the connection. Cables terminate in a housing with an O-ring that forms a waterproof seal; the connection system can therefore be used for underwater connections. Right-handed and left-handed threads may be used on opposite ends of a cable so that tightening or loosening connections on both sides causes twists in the cable to cancel out. The connection system may include a hub with two busses that each have multiple connection points for cables. The hub may distribute power to connected devices and support inter-device communication.