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Reuters: China Mapping Oceans for Potential Underwater War with US

Published March 24, 2026, 07:12
Reuters: China Mapping Oceans for Potential Underwater War with US

China is undertaking an extensive ocean mapping and monitoring operation, collecting data that could be used in a potential underwater confrontation with the United States and its allies. Dozens of Chinese research vessels are operating in the Pacific, Indian, and Arctic Oceans, mapping the seabed and recording data on temperature, salinity, and ocean currents. A prime example is the research vessel Dong Fang Hong 3, which moved in areas of strategic importance, such as around Taiwan, Guam, and critical passages of the Indian Ocean. While part of the research is related to scientific purposes, experts point out that the data also has military value, providing a detailed picture of the underwater environment. The research was based on an analysis of over five years of movements of 42 research vessels, as well as scientific publications and official Chinese records. Analysts emphasize that the extent of the activities exceeds purely scientific research, as China seeks to develop a strong naval presence in open seas, with an emphasis on submarine operations. China has also deployed networks of sensors on the seabed – the so-called “transparent ocean” program – that collect data in real-time, enhancing the ability to detect submarines. The areas at the center of the research include the waters around the Philippines, Japan, Guam, and Hawaii, as well as the Strait of Malacca. US officials express concern, as this data allows for better navigation and weapon placement on the seabed.