As mentioned, the vehicle is tethered to the surface using an umbilical cable. The umbilical can be used in a manner similar to extension cords. Each umbilical has a male connector and a female connector and you can connect multiple tethers together. This capability makes it easy to optimally configure the equipment for shallow or deep dives. The Defender can use standard copper umbilical or for long deployment lengths, hybrid fiber umbilical is available.