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China’s research vessels spend disproportionately more time near critical undersea communications cables across the Pacific than vessels from nearly 50 other nations, a new analysis found.
The findings demonstrate a “persistent pattern of activity in locations where undersea data could have significant military value,” according to the October 2026 analysis by the Center for Strategic and International Studies (CSIS).
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The analysis, covering five years ending in December 2025, helps quantify rising alarm among Indo-Pacific nations over Chinese research vessels operating without permission in their waters.
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The CSIS analysis covers more than 200 civilian research ships from 47 nations. It found that — other than those from China — the vessels did not spend much time near subsea cables on the high seas. China’s activity stood out during 2024, in particular, when seven of its vessels ranked above the 80th percentile for time spent near subsea infrastructure.
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