Reasons for the interruption of the China Mobile East Asia optical cable

The interruption of the China Mobile East Asia optical cable was caused by a combination of vessel-related damage, potential deliberate sabotage, and environmental factors.

Immediate Causes

The most recent disruption near Taiwan involved a Chinese-owned cargo ship, the Shunxin-39, which reportedly snagged and dragged the undersea cable across the seabed, severing it near Keelung Harbor early in the morning. The vessel was registered under multiple flags, including Cameroon and Tanzania, and had Chinese nationals among its crew, complicating accountability and investigation efforts (Taiwan Coast Guard) . In other cases, weather conditions and shifting shipwrecks, such as the Min Lian Yu 63896, have also contributed to cable damage by physically disturbing the seabed where cables lie .

Potential Deliberate Sabotage

Analysts suggest that some cable disruptions may be part of China's grey zone tactics against Taiwan. Repeated incidents, including over 20 cable cuts in the past five years, indicate a pattern where Chinese vessels linger near critical cable locations, potentially using anchors or dragging methods to damage infrastructure while maintaining plausible deniability . Such actions can disrupt communications, hinder emergency response, and affect economic and military coordination without direct confrontation.

Structural and Geopolitical Factors

Undersea cables in East Asia are highly vulnerable due to dense maritime traffic, contested waters, and reliance on foreign-owned infrastructure. The Taiwan Strait and South China Sea are among the busiest shipping lanes, making accidental damage possible, but geopolitical tensions amplify the risk of intentional interference . Permit restrictions, territorial claims, and the US–China rivalry have also delayed cable projects and repairs, increasing the fragility of regional digital infrastructure .

Summary

The interruption of the China Mobile East Asia optical cable can be attributed to:

• Physical damage by vessels, either accidental or deliberate dragging of anchors .
• Potential sabotage as part of strategic pressure or grey zone operations by Chinese actors .
• Environmental and structural vulnerabilities, including shipwrecks, weather, and dense maritime traffic .
• Geopolitical tensions, which complicate cable construction, maintenance, and rapid repair . These factors collectively highlight the strategic vulnerability of undersea cables in East Asia and the need for enhanced monitoring, redundancy, and protective measures to safeguard critical telecommunications infrastructure.