As the underwater work becomes deeper and more precise, ROV's applications become more and more extensive. Modern ROV, adopting the higher resolution camera harmony, large capacity, high bandwidth, low loss optical fiber transmission to become mainstream, more than + 2 ~ 6 optical power + a small amount of copper conductor the internal standard, become the ROV cable line middle use high-density PUR (polyurethane), can work in underwater 6000 m, umbilical cord cable outer adopts multi-layer stainless steel wire armoured bearing, TMS and ROV neutral line between lining and kevlar fiber bearing, outer pressure foaming materials to ensure the cable is the same as the proportion of the water.