GeopoliticsCyber Threat

Severed Lines: The Strategic Vulnerability of Undersea Cable Infrastructure

Recent cable cuts in the Baltic and Red Sea have moved undersea infrastructure from theoretical vulnerability to active threat. The defence gap is structural, not technical.

Marcus Chen

Senior Threat Intelligence Analyst

1 Jun 202615 min read

The Incidents

Five cable cuts in the Baltic Sea since October 2025, each coinciding with Russian vessel activity in the vicinity.

The Structural Defence Gap

There are approximately 600 active submarine cables carrying 99% of intercontinental data traffic. The repair fleet consists of fewer than 60 vessels globally.

NATO and Allied Response

NATO Critical Undersea Infrastructure has been established but faces jurisdictional complexity across national EEZs.