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European Commission Outlines Actions to Protect Subsea Cables

23rd February 2025
A submarine cable map illustrating Ireland's undersea connectivity: a collaborative EU initiative aimed at strengthening the resilience of critical subsea cables, focusing on security, detection, and recovery to safeguard vital communication and energy infrastructure, is currently in progress.
A submarine cable map illustrating Ireland's undersea connectivity: a collaborative EU initiative aimed at strengthening the resilience of critical subsea cables, focusing on security, detection, and recovery to safeguard vital communication and energy infrastructure, is currently in progress. Credit: TeleGeography

The European Commission has issued a joint communication to support all EU member states which have experienced a significant increase in incidents involving subsea cables.

The communication outlines a range of measures to “bolster the resilience of this critical infrastructure, addressing prevention, detection, response, recovery, and deterrence”, the Commission says.

Communication cables connect several member states to one another, link islands to the EU mainland, and connect the EU to the rest of the world, carrying 99% of inter-continental internet traffic.

Subsea electricity cables facilitate the integration of member states' electricity markets, strengthen their security of supply, and deliver offshore renewable energy to the mainland, the Commission says.

“In recent weeks and months, submarine cable incidents have risked causing severe disruptions in essential functions and services in the EU, impacting the daily lives of EU citizens. This initiative responds directly to these threats,” it says.

The communication ranges from preventative measures, such as stepping up security requirements and risk assessments on submarine cables, to detection.

It emphasises the need for “swift action” on response, recovery and developing increased repair capacity, and deterrence through enforced sanctions and diplomatic measures against “hostile actors”.

The Commission says that these “strategic actions complement ongoing work by the Submarine Cable Infrastructure Expert Group, composed of member states and the EU Agency for Cybersecurity”.

“The actions are complementary to NATO's existing activities and support national and regional endeavours, reaffirming Europe's commitment to protecting critical submarine infrastructure, which is essential to global communications and energy security,” it says.

Published in Undersea Cables
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Undersea Cables

Undersea cables are vital to Ireland's connectivity, facilitating high-speed internet, telecommunications, and energy transmission. These cables traverse the Irish Sea, connecting Ireland to the United Kingdom and continental Europe, and play a crucial role in global communications.

Submarine Communications Cables:
Ireland is strategically positioned along major transatlantic communication routes. Approximately 75% of transatlantic cables pass near Irish waters, underscoring the nation's significance in global data transmission.
These cables are typically as wide as a garden hose, with the filaments that carry light signals being extremely thin—roughly the diameter of a human hair. They are sheathed in layers of insulation and protection, with cables laid nearer to shore using extra layers of armoring for enhanced protection.

Energy Interconnectors:
In addition to communication cables, undersea interconnectors are being developed to enhance energy security and support the transition to renewable energy sources. The UK has approved the construction of five new subsea interconnector cables to boost the grid's flexibility amidst rising renewable energy. These projects will link the UK with wind farms in Belgium and the Netherlands, and connect England with Germany, Wales with Ireland, and Scotland with Northern Ireland. The cables, with a combined 6GW capacity, are expected to be operational by 2032, increasing the UK's total interconnector capacity to 18GW.

Security Concerns:
The strategic importance of these undersea cables has raised security concerns. Incidents in the Baltics have heightened awareness about the potential risks to subsea infrastructure. Ireland's historical neutrality and limited defense resources have led to calls for enhanced maritime security and defense investments, including modern surveillance technology and international cooperation. The government's response includes participation in EU security projects and collaboration with neighboring countries on maritime security.

In November 2024, a Russian spy ship, the Yantar, was escorted out of the Irish Sea by the Irish navy after it was found patrolling an area with critical submarine pipelines and cables. The vessel's presence heightened concerns due to its proximity to interconnector cables vital for internet services linking Ireland to the UK, operated by major tech companies such as Google and Microsoft.

Regulatory and Policy Framework:
The protection and maintenance of undersea cables fall under the jurisdiction of national governments, with private companies often responsible for their security. In Ireland, the Department of Communications, Climate Action and Environment oversees the regulation of telecommunications infrastructure, including undersea cables. The Irish Naval Service plays a role in monitoring and protecting maritime infrastructure, including undersea cables. Internationally, the United Nations Convention on the Law of the Sea (UNCLOS) provides a framework for the laying and maintenance of submarine cables, recognizing the "freedom of the seas" and the rights of coastal states.

Conclusion:
Undersea cables are indispensable to Ireland's connectivity and economic infrastructure. Given their strategic importance, ongoing efforts are necessary to ensure their protection and resilience against potential threats. This includes enhancing security measures, international cooperation, and adherence to regulatory frameworks to safeguard these critical assets.