A remotely operated underwater vehicle (ROV) is a tethered underwater mobile device. These are also known as Unmanned Underwater Vehicle (UUV).
Most ROVs are equipped with at least a video camera and lights. Additional equipment is commonly added to expand the vehicle’s capabilities. These may include sonars, magnetometers, a still camera, a manipulator or cutting arm, water samplers, and instruments that measure water clarity, water temperature, water density, sound velocity, light penetration, and temperature.