Chinese survey ship near Philippine undersea cable ignores withdrawal demands
Analysts say the pattern of loitering near seabed cables could be aimed at mapping infrastructure that might later be disrupted.
Reports describe Chinese civilian research vessels loitering near undersea cables in the South China Sea, which analysts say points to efforts to map seabed infrastructure for possible disruption. In one September incident near the Philippines, the Philippine Coast Guard responded to a Chinese research ship that was said to have ignored radio contact, and a Chinese coast guard vessel then intervened, with Beijing complaining of harassment. No confirmed attacks on cables have been reported, though a 2025 US congressional report noted Chinese researchers had publicly described cutting devices able to sever armored cables at depths of 13,000 feet. A CNAS researcher argues that the US and allies must protect subsea cables in peacetime to keep communications intact during a crisis.
Why it matters
The episode points to a growing concern that undersea data cables carrying most international communications could be vulnerable in the Pacific and South China Sea. Reports describe Chinese research vessels spending more time near cables than those of any other nation, and a 2025 US congressional report noted publicly described devices able to sever armored cables at depths of 13,000 feet. No confirmed attacks have been reported. A CNAS researcher argues that the US and its allies need to protect these cables during peacetime so that communications remain intact in a crisis, which means the risk is being treated as a question of resilience before any disruption occurs.
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