With the deeper and deeper underwater operation and higher and higher accuracy of operation, the application of ROV is becoming more and more extensive. Modern ROV adopts higher-definition camera and sonar. Large-capacity, high-bandwidth, low-loss optical fiber transmission has become the mainstream. 2-6 optical fibers + multiple power supplies + a few copper conductor signal lines have become the internal standard of ROV cables. Configuration, the middle layer adopts high-density PUR (polyurethane), which can work under 6000 meters underwater, the outer layer of the umbilical cable adopts multi-layer stainless steel wire armor to bear the load, the inner layer of the neutral cable between TMS and ROV plus Kevlar The fiber is load-bearing, and the outer layer is made of pressure-resistant foam material to ensure that the specific gravity of the cable and seawater is the same.