UK plans tougher protections for subsea cables

If you picture the internet as something weightless and wireless, this story asks you to look down. Far below the surface, subsea cables carry the data that keeps international payments moving, businesses connected and messages travelling between countries. In her speech at RUSI, Liz Lloyd argues that these cables are not a niche bit of engineering. Without them, the UK would be functionally cut off from the outside world. The speech opens with a reminder that this is not a brand-new anxiety. Lloyd reaches back 126 years to Carlyon Bellairs, who asked in the same institute how Britain could make its undersea cables safer. The hardware has changed from telegraph wires to fibre-optic networks, but the question has stayed stubbornly familiar. **What this means:** the problem is old, but the stakes are much bigger now because so much more of daily life depends on the answer.

Lloyd's first big argument is that resilience starts with growth. That can sound vague until you translate it into plain English. The government is saying you do not protect a cable system simply by wrapping it in warnings and barriers. You protect it by making sure the UK has enough modern cables, enough investment, clear enough rules and the industrial ability to fix problems quickly when they happen. The speech ties that directly to the AI boom. Lloyd says private firms are expected to invest tens of billions of pounds in UK AI infrastructure over the coming years, and all of that computing power relies on data moving in and out of the country through cables on the seabed. Many of the lines landing on British shores were laid about twenty years ago, during the first big data-centre surge, so replacement and expansion are now a pressing part of the job.

That is why the government says it is reviewing the legal framework around subsea cables. Lloyd's message is that regulation should support growth rather than slow it down, including a more pragmatic approach to environmental requirements where the impact of cable work is limited, especially in deep water. You do not have to agree with every deregulatory choice to see the policy logic: ministers want cable projects laid, maintained and replaced with fewer avoidable delays. The speech also puts real emphasis on repairs. Lloyd says that when a cable breaks in UK waters, a repair vessel is usually on site within eight days, which the government describes as a world-leading response time. Ministers are now carrying out market engagement on whether the UK can keep a UK-based, UK-flagged sovereign repair capability for the long term, with a final decision promised by the end of the year.

This is where the speech becomes less about cables alone and more about industrial policy. Lloyd points to the expanded National Wealth Fund as a way to bring in private finance, strengthen supply chains and back important infrastructure. She also cites the recently announced £600 million deal for Eastern Green Link 4, a 530km subsea energy connection beneath the North Sea. It is not an internet cable, but the example is doing useful work in the speech: it shows how ministers want the state to support strategic systems under the waterline. **What this means:** the government is trying to present cable resilience as an economic story, not only a defence story. If Britain can build, repair and supply more of this infrastructure at home, ministers believe it can create skilled jobs while making the network harder to knock off balance.

The second pillar is deterrence. Lloyd pushes back hard against the idea that subsea cables sit unseen and undefended, waiting to be attacked. In the speech, she says the UK is already watching, tracking and trying to deter threats to this infrastructure, and she points to a recent example from the Defence Secretary. According to that account, Russian submarines operating in UK waters were tracked by British forces and allies after surveying cables in peacetime so they could be more easily sabotaged in conflict. That part of the speech is meant to send two messages at once. One is outward, to hostile states: you may not be as hidden as you think. The other is inward, to industry and the public: military work at sea is often quiet, but it helps create the stability that companies need if they are going to invest in data, energy and AI systems based in Britain.

But Lloyd also argues that warships and surveillance are only part of deterrence. The government wants newer sensing technology that could help cables do more than carry data, by spotting changes on the seabed or signs of interference before a full disruption takes hold. If you can see a threat earlier, you have a better chance of stopping it, responding to it or proving who is responsible. The speech then turns to the law, and this is one of its clearest policy announcements. Lloyd says ministers will bring forward legislative proposals for consultation to modernise the criminal framework around subsea cable damage. The problem, as she describes it, is 'grey zone' activity: reckless or hostile acts that sit somewhere between accident and open warfare, where intent is murky and older laws are difficult to use. **What this means:** the government wants rules that are clearer, tougher and harder to dodge.

The third pillar is security, and here the speech makes an important distinction. Most cable breaks, Lloyd says, are not acts of deliberate sabotage. They happen because of natural movement on the seabed or because anchors are dragged across it. That matters, because it shifts the conversation away from spy-thriller assumptions and towards everyday risk reduction, where practical coordination can prevent expensive disruption. To cut accidental damage, Lloyd formally endorses the European Subsea Cables Association's new Fishing Liaison Guidelines, drawn up with government, industry and the fishing sector. She also highlights cable landing stations, the places where undersea cables come ashore and connect into the wider network. These sites are bottlenecks, so the government says it is working with the National Protective Security Authority and the National Cyber Security Centre on updated physical and cyber guidance for operators. Building on the Telecommunications Security Act, ministers also plan to consult on baseline security duties across the network, including risk management, response plans and faster incident reporting.

The speech goes further than today's risks. Using analysis with The Crown Estate, ministers say the UK will need significantly more cable capacity by 2035 as digital demand rises. That creates a planning problem as well as a security one. The seabed is getting busier, especially as offshore wind expands, so the government says it is mapping future routes and trying to avoid choke points where too many cables cluster together. There is an international side as well. Lloyd says the UK is working with Ireland to line up incident-response plans and will hold a joint exercise later this year on how to respond to major disruption. She also points to the International Advisory Body for Submarine Cable Resilience as a way of pushing higher standards beyond British waters. If you strip the speech back to one lesson, it is this: the internet is not a cloud floating above your head. It is physical infrastructure on the seabed. When you hear ministers talk about resilience, read it as the ability to keep everyday life moving even when something under the sea goes wrong.