Royal Navy Tracks Russian Submarines Surveying UK Undersea Cables in North Atlantic
The UK Ministry of Defence has revealed that the Royal Navy and Royal Air Force spent more than a month tracking three Russian submarines that were covertly surveying critical undersea cables and pipelines in the North Atlantic — infrastructure that carries over 90% of Britain's daily internet traffic.
Defence Secretary John Healey made the announcement on Thursday, 9 April, accusing Russia of conducting a "covert" operation to map vital undersea infrastructure. He warned that any attempt to damage the cables or pipelines would "not be tolerated and will have serious consequences."
What Happened
The Russian deployment consisted of an Akula-class nuclear-powered submarine — which Healey described as a diversionary tactic — and two deep-sea submarines from Russia's Main Directorate for Deep Sea Research (Gugi). The Gugi vessels are specifically designed to survey underwater infrastructure during peacetime and have the capability to damage or destroy vital links in the event of conflict.
The operation took place within the UK's exclusive economic zone, extending up to 200 nautical miles from the British coastline. The Royal Navy deployed the frigate HMS St Albans, the fuel tanker RFA Tidespring, and anti-submarine Merlin helicopters, alongside P8 marine patrol aircraft, to monitor the Russian vessels around the clock. Norwegian forces also assisted in the surveillance operation.
Key Developments
Healey stated that British forces regularly dropped sonar buoys to demonstrate to the Russian crews that their movements were being tracked and exposed. The Akula submarine eventually retreated home after being closely monitored, and the two Gugi submarines also departed UK waters and headed north.
The Defence Secretary directly addressed President Putin in his statement: "We see you. We see your activity over our cables and our pipelines, and you should know that any attempt to damage them will not be tolerated and will have serious consequences." Prime Minister Keir Starmer also affirmed the UK's resolve to protect its infrastructure from what he described as Putin's aggression.
Healey noted that the Russian operation occurred "while the eyes of many were trained on the Middle East" due to the ongoing US-Iran conflict, suggesting Moscow attempted to capitalise on global distractions. The Russian embassy in London denied the claims, stating that Russia was "not threatening underwater infrastructure."
Why It Matters
The stakes are enormous. Over 90% of the UK's daily internet traffic travels via approximately 60 undersea cables, and around 77% of the country's gas imports arrive from Norway through North Sea pipelines. The head of the Royal Navy, General Sir Gwynn Jenkins, stated that the Russian threat in the North Atlantic is growing, with continued investment in submarine capabilities.
The incident is the latest example of what defence analysts describe as Russia's "hybrid warfare" — hostile acts designed to stop short of an attributable, lethal attack while gathering intelligence and testing Western responses.
What's Next
The Ministry of Defence confirmed there was no evidence that any pipelines or cables had been damaged, though verification efforts were ongoing. The UK government is expected to raise the matter with NATO allies and may use the incident to press for increased investment in undersea infrastructure protection. The Cyber Security and Resilience Bill, currently passing through Parliament, is expected to expand critical infrastructure protection to include data centres and large load controllers.
Full details of the operation were reported by The Guardian and BBC News.
