Reports of suspected cable surveying and a separate coast guard confrontation have renewed concern over Taiwan’s communications links and the security of surrounding waters.
Concerns over undersea cable security are drawing fresh attention across East Asia after reports of Chinese research ships operating near cable routes around Taiwan, Japan and the Philippines. Separately, Taiwan has reported a Chinese coast guard incursion near the Pratas Islands. [1][2]
Chinese research ships draw scrutiny
The Taipei Times reported on 2 November, citing Japan’s Yomiuri Shimbun, that four Chinese survey ships had repeatedly slowed, stopped or changed course near international cable routes around Taiwan since May. The assessment drew on ship tracking analysis by geospatial intelligence company ingeniSPACE and information from Taiwanese authorities. [1]
The ships identified were Xiangyang Hong 22, Tongji, Jia Geng and an AIS-identified vessel called Mushanzi. ingeniSPACE said similar activity had been observed near Japan and the Philippines. Taiwanese officials said the findings were consistent with their understanding and that cable intelligence gathering could not be ruled out. [1]
These movements raise questions about the ships’ purpose. They do not, by themselves, establish intent or demonstrate that the vessels damaged a cable.
Why seabed surveys attract security attention
A study published by the Center for Strategic and International Studies on 8 October compared more than 200 research vessels from China and 47 other countries. It found that Chinese vessels spent a disproportionately large share of their observed time near critical infrastructure on the high seas. [3]
The report explains that seabed maps and information about currents, temperature and salinity can support military operations as well as civilian research. This makes the purpose of some survey missions difficult to determine from their movements alone. [3]
Taiwan reports a separate Pratas encounter
Taiwan’s coast guard said a Chinese coast guard vessel approached the Taiwan-controlled Pratas Islands on Saturday, 31 October. Reuters reported that Taiwan said it had expelled Chinese coast guard vessels from those waters 13 times this year. The islands lie in the northern South China Sea, more than 400 kilometres from Taiwan. [2]
Separately, China announced a coast guard patrol east of Taiwan, describing it as law enforcement. Taiwan accused the patrol of harassing shipping and rejected Beijing’s jurisdiction claims. China regards Taiwan as its territory; Taiwan’s government rejects that position. These competing claims remain central to the dispute. [2]
Taipei calls for better maritime information
On 2 November, Kuan Bi-ling, who heads Taiwan’s Ocean Affairs Council, said Taiwan needed to conduct its own ocean surveys and control its maritime information. Speaking in Tainan, she called for better equipment and intelligence to identify threats earlier, Reuters reported. She linked maritime security to Taiwan’s energy supplies, transport and role in global trade. [4]
What is at stake for undersea cable security
A September report published by the US-China Economic and Security Review Commission identified cables connecting the United States with Taiwan, Japan and the Philippines as particularly vulnerable. It warned that disruption could force data onto slower routes and affect internet connections, financial services and cloud platforms. [5]
The report also stresses that most cable breakages result from accidents or natural causes. Suspicious activity therefore requires investigation rather than an automatic assumption of sabotage. [5]
Impact and conclusion
The immediate concern is the risk to infrastructure that businesses and households depend on. A serious outage could affect users beyond the area where a cable is damaged. The policy priority is stronger monitoring, alternative connections and faster repairs, alongside evidence that establishes what happened and who was responsible. [3][5]
The surveying allegations and Pratas confrontation illustrate different aspects of regional tension. Neither establishes that a new cable attack has occurred. Protecting communications while avoiding unsupported conclusions will be essential as authorities assess the reported activity.
Sources and references
[1] Taipei Times — Chinese ships suspected of spying — 2 November 2026
[2] Reuters via ThePrint — Taiwan says China harassing shipping with east coast patrol — 1 November 2026
[5] USCC — China’s Gray Zone Threats to Trans-Pacific Undersea Cables — 22 September 2026
