A tethered unmanned remotely operated vehicle (ROV), also known as an underwater vehicle, is a type of extreme operating robot that works underwater and can dive into the water to perform certain operations on behalf of a human. It is powered by the staff on the surface mother ship, through the umbilical cable connected to the submersible, to manipulate or control the submersible, through underwater television, sonar and other special equipment for observation, but also through the manipulator, underwater operations, is an important equipment in the international ocean scientific research. ROV buoys produced by OOT that could be customized to meet customer requirements for density, depth, and buoyancy.