Ireland's subsea cables put maritime protection in the spotlight

Ireland's role in international data connections is drawing attention to the protection of cables beneath its surrounding seas. An published report on November 11 examined concern over interference with subsea infrastructure and the difficulty of monitoring a large maritime area. It describes a security risk, not a newly confirmed attack on an Irish cable.

Irish government material identifies undersea data cables, gas pipelines, electricity interconnectors and offshore energy infrastructure as strategic assets. Its maritime security approach includes cooperation between state bodies, international partners and private infrastructure operators, rather than relying on naval patrols alone.

The Department of Defence announced in July that new statutory powers had been signed into law. Section 15 of the Criminal Law, Civil Law and Defence (Miscellaneous Provisions) Act 2026 amended the Defence Act 1954, providing powers to safeguard state security where a foreign ship's activity threatens it in territorial or internal waters, or where sovereign rights and jurisdiction are at risk in the exclusive economic zone.

The legislation refers to force only where reasonable, proportionate and necessary and requires guidance for its use. Separately, Ireland endorsed an international statement on subsea-cable security and resilience in March. Those measures set out legal and cooperative responses to risk; they do not guarantee that every cable can be protected or establish responsibility for any particular incident.