China Building Covert Underwater Surveillance Network

China is developing a secret underwater surveillance system known as the “Great Undersea Wall” to monitor strategic maritime chokepoints [1, 2].

This network represents a significant shift in naval intelligence gathering. By mapping the deep sea and deploying hidden sensors, China can track the movement of foreign vessels and gain a tactical advantage in potential future conflicts.

The existence of this system gained attention after a fisherman in Indonesia retrieved a mysterious device from the sea [1, 2]. Experts link this hardware to a broader effort by China to establish a persistent presence on the ocean floor. The system relies on deep-sea mapping and the use of hidden surveillance ships to deploy and maintain the network [1, 2].

Jennifer Parker, a former Australian naval officer and professor of defense and security, said the strategic implications of these operations are significant [1, 2]. The goal of the initiative is to gather intelligence that could shape the nature of naval warfare by providing real-time data on vessel transit through critical waters [1, 2].

These operations focus on critical chokepoints where naval traffic is concentrated. By controlling the information flow from the seabed, China aims to create an invisible barrier that alerts its military to the presence of submarines or surface ships [1, 2]. The mapping process allows for the precise placement of sensors that remain undetected by traditional sonar or satellite surveillance [1, 2].

The discovery of the device in Indonesian waters underscores the geographic reach of the program. It suggests that the surveillance grid extends far beyond China's immediate coastline to encompass vital shipping lanes in Southeast Asia [1, 2].