Britain Reveals Secret Russian Submarine Operation Targeting Undersea Infrastructure

Britain's Secretary of State for Defence John Healey revealed on Thursday that three Russian submarines conducted a covert month-long operation over undersea cables and pipelines in the North Atlantic, north of the United Kingdom, before withdrawing after British and allied forces exposed the mission. Healey confirmed at a Downing Street press conference that the Royal Navy and allied partners, including Norway, monitored the vessels around the clock and deployed sonar buoys alongside the submarines to make clear their movements had been detected. The operation involved one Akula-class nuclear-powered attack submarine and two specialist deep-sea submersibles belonging to Russia's Main Directorate of Deep-Sea Research. Healey said he was confident no cables or pipelines had been damaged, though he added that verification with North Sea allies would be required. Russia rejected the accusations, with its London embassy stating through the TASS agency that Moscow does not threaten British undersea infrastructure and does not use aggressive rhetoric on the matter.

Akula submarine used as decoy while spy vessels hovered over cables Healey explained that British forces quickly established the Akula-class submarine had been deployed as a diversionary maneuver, designed to draw British countermeasures while the two GUGI submersibles conducted surveillance directly over critical undersea infrastructure. The two specialist vessels are, according to the British Ministry of Defence, designed to survey underwater infrastructure during peacetime and sabotage it during conflict. On the British side, the Royal Navy deployed the frigate HMS St Albans, Merlin anti-submarine helicopters, and a Royal Air Force P-8 Orion maritime patrol aircraft. 500 (UK military personnel) — involved in the month-long monitoring operation The operation also drew in allied support, with Norway playing a central role alongside other NATO partners. Once British and allied forces made clear the submarines were being watched at every stage, all three Russian vessels retreated and returned to base, according to Healey. „We've exposed those covert operations. We've made clear to him and his submarines that we've watched them every step of the way.” — John Healey via Al Jazeera

Healey issues direct warning to Putin over infrastructure threats Healey addressed Russian President Vladimir Putin directly at the press conference, delivering a pointed message about the consequences of any future action against British infrastructure. „To President Putin, I say 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.” — John Healey via Irish Independent The Defence Secretary framed the operation within a broader pattern of Russian hybrid activity, arguing that Moscow had timed the submarine mission to exploit global attention focused on the conflict in the Middle East. He said the episode demonstrated why Britain was right to resist calls to deploy major naval assets, such as an aircraft carrier, to the Persian Gulf, arguing that threats closer to home remained acute. Healey also announced an additional 100 (million pounds) — in new UK investment in submarine-hunting aircraft and said Britain would launch the Atlantic Bastion programme to build a hybrid naval force. He described the undersea network as carrying 99 (percent) — of UK international telecommunications and data traffic as well as approximately half of the gas used to heat British homes.

Concerns about the security of undersea cables and pipelines in European waters have grown significantly since Russia launched its full-scale invasion of Ukraine in February 2022. Incidents involving damage to gas pipelines and telecommunications cables, primarily in the Baltic Sea, have repeatedly occurred in the years since, with Western governments suspecting Russian involvement. NATO has increased its regional maritime and air presence in response. The United Kingdom has approximately 60 undersea cables connecting it to the international network, including links to North America and continental Europe. Globally, more than 600 undersea cables stretch across 1.4 million kilometres of ocean, carrying the vast majority of international internet traffic and financial data.

Russian warship escorts sanctioned tankers through the English Channel Separately from the submarine operation, it emerged on Thursday that the Russian frigate Admiral Grigorovich, a Black Sea Fleet vessel, had escorted two sanctioned oil tankers through the English Channel, in what was described as an open challenge to Prime Minister Keir Starmer's stated threat to seize vessels from Russia's so-called shadow fleet. The tankers were also accompanied by a British Royal Navy vessel during their passage, according to reporting by The Telegraph cited in source articles. The parallel incidents — the submarine operation in the North Atlantic and the surface escort in the Channel — underscored what Healey described as an escalating pattern of Russian activity around British waters and critical infrastructure. Healey warned of an increasing threat to undersea pipelines and energy cables and said that despite the noise of the Middle East crisis, Russia remained the greatest threat to British national security closer to home. Prime Minister Keir Starmer has stated that Britain will not hesitate to take action against Russian aggression, framing the protection of undersea infrastructure as directly linked to household energy costs for British citizens.

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