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The Guardian - UK
The Guardian - UK
Lifestyle
Aida Edemariam

Inside the undersea kingdom: the secret, sinister battle to control what lies beneath the waves

Woman wearing black shirt and jeans standing on rocks at the beach in photographed in Folkestone, 23 September 2026
‘In this environment of geopolitical tension, it feels like an incredible vulnerability’ … undersea security expert Elisabeth Braw. Photograph: Greg Funnell/The Guardian

On Christmas Day 2024, six weeks before Estonia, Latvia and Lithuania were due to disconnect themselves from Russia’s power grid, a Finnish engineer was just about to sit down to lunch when his phone rang. He was responsible for the Finnish side of the undersea cables that keep Finland and the Baltic states supplied with electricity, and one was malfunctioning. Within a couple of hours, authorities knew that a Cook Islands-registered tanker called the Eagle S, part of the shadow fleet carrying sanctioned Russian oil, in this case to Egypt, had sailed over the cable at the moment and location at which it had stopped working. The coastguard hailed the Eagle S. Were their anchors up? Yes, they replied – though they did not seem to check – and sailed on.

Three hours later the ship hit another four cables in quick succession, nearly hobbling internet provision in Finland and Estonia – and was minutes away from a major electricity cable and the Balticconnector, which supplies the two countries with gas. Finland scrambled the border guard, which pulled up alongside the tanker and demanded the crew take up its anchor. But the Eagle S was not in Finnish territorial waters: the authorities could not force the captain to comply, and they did not know who or what might come to his aid.

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