Ireland raises alarm over threats to undersea cables near its waters

Ireland has warned that undersea cables near its waters face a growing threat from hostile actors, highlighting the strategic importance of the routes that cross the Atlantic floor. The concern centres on infrastructure that carries much of the data linking North America and Europe, including communications and financial traffic. Officials say Ireland's position makes it a key point on these networks, even though it is a small state with limited military surveillance capacity.

According to the Irish government, about 75 percent of transatlantic subsea cables pass through or near Irish waters. That gives the country an outsized role in the security of global digital infrastructure, especially as Ireland hosts major United States technology companies and a growing number of data centres. The report says increased activity by Russian vessels near undersea infrastructure in recent years has sharpened fears that cables around Ireland could be targeted for interference.

The warning draws on a series of incidents involving the Russian vessel Yantar, which is officially described as an oceanographic research ship. In November 2024, the vessel was monitored near undersea infrastructure in the Irish Sea before being escorted out of Ireland's exclusive economic zone by the Irish Navy. Two months later, the United Kingdom's defence ministry said the ship had been caught loitering over critical undersea infrastructure in UK waters, and in late 2025 Britain accused it of directing lasers at Royal Air Force pilots tracking its movements in the North Sea.

The issue matters because subsea cables underpin much of the world's communications and a large share of international financial transactions. Any disruption to them could have consequences far beyond Ireland, affecting data flows between continents and the resilience of digital services used by governments, companies and households. Ireland's role is especially sensitive because it sits on a major transatlantic corridor while also remaining militarily neutral and outside NATO.

The report also points to structural limits in Ireland's ability to monitor and protect its waters. It says the country has the lowest defence spending as a share of gross domestic product in the European Union and that its navy has no submarines. That has fuelled debate over whether neutrality should continue to shape defence policy as concerns grow about sabotage, surveillance and other forms of hybrid pressure around critical infrastructure.

What remains unclear is whether the current warning reflects a specific imminent threat or a broader assessment of risk. The report does not identify any new incident involving damage to cables, and it does not say that any attack has taken place. What is clear is that Ireland is treating the security of subsea infrastructure as a growing strategic issue, with the activity of Russian vessels likely to remain under close watch.

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