Russia a 'risk' to undersea cables, defence chief warns The UK's most senior military officer has warned of a new threat posed by Russia to communications and internet cables that run under the sea. Air Chief Marshal Sir Stuart Peach, the chief of the defence staff, said Britain and Nato needed to prioritise protecting the lines of communication. He said it would be an "immediately and potentially catastrophic" hit to the economy if they were cut or disrupted. The cables criss-cross the seabed, connecting up countries and continents. Could Russian submarines cut off the internet? How much of a threat does Russia pose? Four facts about undersea cables Speaking to the Royal United Services Institute defence think tank, Sir Stuart said the vulnerability of undersea lines posed a "new risk to our way of life". "In response to the threat posed by the modernisation of the Russian navy, both nuclear and conventional submarines and ships, we along with our Atlantic allies have prioritised missions and tasks to protect the sea lines of communication," he said. "This sounds like a re-run of old missions, actually as I'm about to say, it is very, very important that we understand how important that mission is for the North Atlantic Treaty Organization. "Because Russia in addition to new ships and submarines continues to perfect both unconventional capabilities and information warfare." The UK and its allies needed to "match and understand Russian fleet modernisation", he added. "There is a new risk to our way of life, which is the vulnerability of the cables that criss-cross the seabeds," he said. "Can you imagine a scenario where those cables are cut or disrupted, which would immediately and potentially catastrophically affect both our economy and other ways of living." Where are the undersea cables? According to a report for the Policy Exchange think tank, which was published earlier this month, the world's submarine network comprises an estimated 213 independent cable systems and 545,018 miles (877,121 km) of fibre. But it said a lack of formal state ownership meant cables do not have strong protection in international law. Despite that, an estimated 97% of global communications and $10 trillion in daily financial transactions are transmitted by cables under the ocean. "Undersea cables are the indispensable infrastructure of our time, essential to our modern life and digital economy, yet they are inadequately protected and highly vulnerable to attack at sea and on land, from both hostile states and terrorists," the report concluded. Conservative MP Rishi Sunak, author of the report, warned a successful attack on the UK's network of undersea communications cables could deal a "crippling blow" to the country's security and economy. 'Dark cables' He said the locations of the cables were "both isolated and publicly available" and a successful attack would be an "existential threat to our security". Writing a foreword to the document, Admiral James Stavridis, a former US Navy officer and ex-Nato supreme allied commander, said: "It is not satellites in the sky, but pipes on the ocean floor that form the backbone of the world's economy." "We have allowed this vital infrastructure to grow increasingly vulnerable and this should worry us all," he added, warning of a potential threat from China and Iran, as well as Russia. He called for the creation of more "dark cables", to be kept in reserve, and said Nato must be prepared to defend global submarine cables, if necessary. It comes after a ship dragging its anchor cut three undersea internet cables connecting the Channel Islands to the UK last year. It resulted in slower internet connections and phone problems across the islands. Related Topics Russia Internet Nato Share this story About sharing More on this story Sir Stuart Peach named as new UK joint forces commander 15 September 2011 Big net firms invest in trans-Pacific cable project 31 October 2017 France-UK undersea cable plans 'to go ahead' 15 August 2017 Undersea cable break: Four things you wanted to know 1 December 2016 Top Stories EU leaders set to move Brexit to next stage Theresa May was applauded by European counterparts at a dinner on Thursday, ahead of the EU decision. 15 December 2017 French school bus cut in two in rail crash 15 December 2017 My father fought the CIA's secret war in Laos 15 December 2017 Features Why is Disney buying Fox? My father fought the CIA's secret war in Laos Should Germany pay its migrants to leave? What's changed in US-Cuba relations under Trump? Geminid meteor shower lights up sky In 1977 I took an exam that changed China Booze calculator: What's your drinking nationality? Lock out: The Austrian hotel that was hacked four times.