China is currently conducting a massive ocean mapping and surveillance campaign across the Pacific, Indian, and Arctic Oceans. The primary objective of this initiative is to acquire precise data regarding the seabed topography, ocean depths, and internal geographical features of these strategic waters. According to naval experts and international observers, this data could play a decisive role in the conduct of future submarine warfare. This activity comes at a time of increasing global competition over maritime security and strategic control of international waters.
Movements of Research Vessels and Strategic Corridors
Reports from Reuters and analysis of ship-tracking data reveal that the research vessel Dong Fang Hong 3, affiliated with the Ocean University of China, has made continuous voyages through strategically significant areas during 2024 and 2025. S. military stronghold of Guam. Also, in March 2025, the ship traversed the waters between Sri Lanka and Indonesia, including the critical Malacca Strait. This route is considered a lifeline for global maritime trade. In October 2024, the same vessel tested powerful Chinese maritime sensors capable of identifying underwater objects near Japan.
Technical Mechanisms of Ocean Mapping and SONAR
Ocean mapping is a complex process used to create charts of the seafloor and its characteristics. This is primarily achieved through SONAR (Sound Navigation and Ranging) technology. The system emits sound waves into the ocean and records the time it takes for them to bounce back. Based on this time interval, the exact depth of the ocean floor is calculated. Developed in the 1920s, this technology saw significant improvements in the 1960s with the introduction of multibeam sonar systems. Multibeam systems use multiple sound beams in a fan-shaped pattern, making it possible to obtain high-resolution data over a large area more efficiently.
Strategic Military Implications for Submarine Operations
Experts believe that accurate mapping of the seabed is essential for military operations, particularly submarine navigation. According to Peter Scott, former chief of Australia's submarine force, the survey data obtained from these vessels could prove invaluable in battlefield preparation for Chinese submarines. Knowledge of underwater mountains, trenches, and temperature variations allows submarines to navigate and hide more effectively. On top of that, this data assists in identifying oil and gas reserves, locating marine habitats, and determining safe routes for commercial shipping.
Scale of the Mission and Surveillance Network
China's mission isn't limited to a single vessel. Analysis of data from Starboard Maritime Intelligence and government records indicates that approximately 42 research vessels and hundreds of maritime sensors are involved in this mission. Studying the activities of these vessels over the past five years clarifies that China is strengthening its presence in the Pacific, Indian, and Arctic Oceans through scientific research. Journal articles from Chinese universities and government institutions suggest that this data collection is part of a long-term strategic plan aimed at gaining an edge in maritime domain awareness.
Challenges in High-Resolution Seabed Data Collection
Mapping the most remote and deepest parts of the ocean is an extremely difficult and expensive task. Deploying ships for long periods requires significant logistics and financial resources. According to statistics, as of 2022, high-resolution data for only just over 23% of the world's seabed was publicly available. China is investing heavily to fill this gap and protect its national interests. Increased activity in regions like the Arctic also indicates that China seeks to strengthen its hold on new maritime routes and resources, which could influence future global trade and security equations.