Subsea inspection robot
China’s first subsea cable inspection robot has entered service, aiming to improve security and maintenance for undersea energy and communications networks. The robot was presented as a capability that enhances monitoring of critical subsea infrastructure. (x.com/CCTV_Plus)
Subsea cables are the internet’s seafloor wires, and China says its first home-grown robot for inspecting them has now entered service. (news.cgtn.com) China Global Television Network said on April 14 that the robot combines sonar, electromagnetic detection and a mechanical arm to find buried cables, identify faults and inspect them underwater. It works with unmanned surface vessels and moves at 5 to 7 kilometers per hour using eight thrusters. (news.cgtn.com) China Southern Power Grid said in March 2025 that it had already demonstrated a system built around a shore command center, an unmanned boat and an underwater robot in the Hainan Networking Project’s submarine cable protection zone. The company said that setup cut operating time by more than 40 percent compared with manned inspections. (eng.csg.cn) The Chinese-language release from China Southern Power Grid said the system was launched on March 21, 2025, from Linshi Port in Chengmai, Hainan, and was being used on the 500-kilovolt Hainan interconnection project. The company said command latency between shore, vessel and robot was kept below one second. (csg.cn) These inspections target infrastructure that carries both electricity and data. The International Telecommunication Union says submarine telecom cables handle more than 99 percent of international data exchange, and it reported more than 200 cable repairs worldwide in 2023. (itu.int 1) (itu.int 2) The job is hard because cables can be buried, exposed or shifted off their mapped route by currents and seabed movement. Hydro International reported in 2025 that installation drift can move a cable 5 to 10 percent of the water depth off course, while underwater navigation errors build as robots travel. (hydro-international.com) That is why operators use several sensing methods at once. China Global Television Network said the new robot’s mix of sonar, electromagnetic tools and mechanical manipulation lets it inspect cables “like an underwater computed tomography scan,” while China Southern Power Grid described its broader platform as combining acoustic, optical, electrical and magnetic sensing. (news.cgtn.com) (csg.cn) China’s state outlets framed the robot as a way to protect energy links, communications networks, offshore wind projects and marine oil and gas facilities. The next test is whether the system moves from a Hainan demonstration and initial deployment into routine inspection across more subsea infrastructure. (news.cgtn.com) (csg.cn)
