Remotely Operated Vehicle Torque Tool is a specialized robotic attachment used in subsea oil and gas, renewable energy, and scientific research.
Essentially, it is a high-powered, underwater wrench that allows an ROV to operate subsea valves, chokes, and connectors. Since a human can't go down several thousand meters to turn a valve, the ROV flies to the site, docks with the equipment, and uses this tool to apply precise rotational force.
These tools are engineered to handle extreme pressure and deliver massive amounts of power while maintaining fine control. Torque tools are categorized by the amount of force they can output. Subsea interfaces are standardized so that any manufacturer's tool can work on any subsea tree.