
EXCLUSIVE The critical undersea cables at the mercy of Chinese and Russian saboteurs: Fears UK is 'woefully' unprepared for threat of coordinated attacks by 'shadow fleets' on vulnerable Western infrastructure
This is the network of critical underseas cables at the mercy of Chinese and Russian saboteurs - and the multiple ways they could be attacked.
A new report has warned Britain remains 'woefully' underprepared for the threat of strikes on its maritime infrastructure in the face of growing aggression.
The China Strategic Risks Institute (CSRI) looked at 12 incidents of alleged undersea cable sabotage between January 2021 and April 2025 in Europe and Taiwan.
Out of the 10 cases where a suspect vessel was identified, eight were linked to China or Russia by flag or ownership.
Report author Andrew Yeh said the involvement of Chinese ships in cable breakages in Europe and Russian ships in those near Taiwan indicated 'plausible' coordination.
The Institute identified the UK as a 'likely target' for future Chinese-Russian 'grey zone' operations - a term used to describe the state between peace and open war.
This map produced by MailOnline shows the dizzying extent of the UK's network of cables, which are used to transmit data used for everything from online shopping to banking, personal messages and government communications.
As the term 'grey zone' suggests, acts of cable sabotage are usually intended to be deniable, and usually involve ships dragging their anchors or deploying fishing nets. But more aggressive methods are available, including the use of divers or remote-operated subs to lay explosives fitted with timers.
The UK is the landing point for at least 60 undersea cable systems, including nine of the 15 undersea cables that link Europe to North America.
Mr Yeh wrote in his report: 'Undersea cables underpin economic security and global prosperity in the digital age, carrying 99 per cent of intercontinental data traffic.
'Undersea cables are vital for both civilian and defence infrastructure, including future AI-powered technologies.
'As a key hub in Euro-Atlantic cable infrastructure, the UK is a likely target for future Russian and Chinese grey-zone operations – posing a new and complex challenge for its maritime defence and surveillance systems.'
The analyst called for the UK to be 'clear-eyed and proactive' in addressing grey-zone threats to undersea infrastructure.
He called for increased surveillance over critical cables, the publication of a blacklist of suspect vessels and the stockpiling of cable parts to allow for rapid repairs following acts of sabotage.
The issue of undersea cables was mentioned in the recent Strategic Defence Review.
It stated: 'Undersea pipelines and data cables are critical for sustaining daily national life. The maritime domain is increasingly vulnerable.
'The Royal Navy must be prepared to deter maritime incidents similar to the sabotage of the Nord Stream 2 gas pipeline and the cutting of undersea data cables in UK and international waters.'
Since October 2023, at least 11 subsea cables in the Baltic have been damaged in suspected attacks.
Last year, Finnish authorities took the unprecedented step of intercepting one of these ships, the Eagle S, and taking it back into its territorial waters.
Eagle S is flagged in the Cook Islands but has been described by Finnish customs officials as part of Russia's shadow fleet of fuel tankers that state-run companies have used to circumnavigate sanctions.
Its anchor was accused of causing damage to the Estlink-2 power cable, which takes electricity from Finland to Estonia across the Baltic Sea, after it went down just after noon on Christmas Day.
Further incidents in the North Sea have seen cables running on the seabed damaged, while separately, Russian spy ships - including one called the Yantar - have been intercepted in the Channel while hovering over the communication lines.
At a parliamentary committee hearing last month, MPs were warned that Britain had forgotten how important deep sea cables are to modern society.
Military chiefs and political leaders were accused of putting a greater focus on 'distant wars' in recent years than protecting this crucial infrastructure.
It comes as British defence experts revealed a new undersea robot that is designed to protect cables against sabotage attempts.
Video footage shows the device, which is adapted from a commercially available remotely operated vehicle (ROV), approaching and blasting a simulated target.
The robot will help deal with sabotage threats and clear unexploded ordnance, doing jobs that would normally put both divers and their vessels at risk.
The Defence Science and Technology Laboratory (DSTL), part of the Ministry of Defence, has made the device with industry partners in an aim to save lives at sea.
Experts have incorporated or developed systems so the ROV can detect unexploded ordnance and remotely place explosive charges to enable safe neutralisation.
Trials for the project funded by the Royal Navy have already taken place at Horsea Island in Portsmouth, Portland Harbour in Dorset, South Wales and in Norway.
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