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Uk News
Apr 09, 2026

British Forces Thwart Russian Submarine Survey of Critical Atlantic Cable Network, Defence Secretary Announces

AI Summary
The UK defence secretary confirmed that a Royal Navy warship and a P‑8 maritime patrol aircraft tracked and deterred three Russian submarines attempting to map vital Atlantic undersea cables and pipelines, forcing them to leave the area after a month‑long operation involving 500 personnel.

A British warship together with a Royal Air Force P‑8 maritime patrol aircraft monitored three Russian submarines that were trying to survey key undersea infrastructure in the North Atlantic, the defence secretary John Healey said at a Downing Street briefing.

Healey explained that the operation, which lasted **over a month**, took place not within UK territorial waters but in the country's exclusive economic zone – the area extending up to 200 nautical miles from the coastline and bordering neighbouring zones.

The Russian vessels comprised an Akula‑class nuclear‑powered submarine and two deep‑sea research submarines from the GUGI directorate, a unit that normally conducts peacetime surveys of underwater infrastructure but possesses the capability to damage it in conflict.

According to the minister, the British forces tracked and deterred any malign activity around the submarines 24/7, deploying regular sonar buoys to demonstrate continuous monitoring. The presence of the Royal Navy ship and the P‑8 aircraft, supported by NATO allies, left the Russian crews with “no doubt that they were being watched”.

As a result, the Akula submarine “retreated home” and the two GUGI subs subsequently exited the UK’s maritime zone, heading northward. The operation involved **about 500 UK personnel**.

Healey stressed that there was **no evidence of damage** to any pipelines or cables, but that UK forces and allies would verify the integrity of the infrastructure. He warned President Putin that any attempt to sabotage the network would “not be tolerated and will have serious consequences”.

The defence secretary framed the incident as proof that Moscow is “the primary threat to the UK and to NATO”, underscoring the need for heightened vigilance over undersea assets amid the broader security fallout from the Ukraine war and recent tensions in the Middle East.

He also linked the episode to broader defence policy, stating that the successful deterrence demonstrates the UK’s ability to detect, deter and, if necessary, respond to threats against its critical maritime infrastructure, while calling for continued investment in defence capabilities.