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Report on Security and Resilience of EU Submarine Cable Infrastructures

  • REPORT / STUDY
  • Publication 23 October 2025

This report maps the EU submarine cable infrastructure, detailing risk assessments and stress tests.

Illustration of a submarine fiber optic cable, showing the inner strands glowing and transmitting light signals against a dark blue background.
GettyImages © Dragon Claws.

The Submarine Cable Infrastructures informal Expert Group has adopted this report on the basis of a study contracted by the Commission and informed by discussions and written exchanges between Member States and the Commission throughout 2024 and 2025.

The main body of the report provides key insights regarding the context and mapping of data cable infrastructures, the risk assessment approach and the stress test methodology. Complementary factual information is provided in the Annex.

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1- Main Report - Submarine Cables Expert Group Mapping risks stress tests
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2 - Annex - Submarine Cables Expert Group Mapping risks stress tests
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