UK Proposes 14-Year Jail Terms for Cable Sabotage

The UK government wants much tougher punishments for anyone who damages the cables and pipelines on the seabed around Britain. Under proposals published by the Department for Culture, Media and Sport (DCMS) on 22 October, deliberate damage could carry up to 14 years in prison, with unlimited fines.

These are proposals, not law. They are set out in a White Paper that is now open for a 12-week public consultation, which closes on 14 January 2027. The plans also add new security duties for subsea telecoms cable companies and a power for ministers to direct them in a national security emergency.

In brief

What happened: The UK published a White Paper proposing new offences, prison terms of up to 14 years and unlimited fines for damaging critical undersea infrastructure. Why it matters: The main law protecting subsea cables dates from 1885 and carries far lighter penalties. What’s next: The consultation closes at 11:59pm UK time on 14 January 2027; no bill has been introduced.

A new offence with three levels of blame

The White Paper proposes a new offence of causing a “security compromise” to undersea cables, pipelines and interconnectors. It would cover physical damage and also “remote electronic interference, cyber activity and certain preparatory conduct”, such as mapping or surveying infrastructure in preparation for a later attack.

Penalties would depend on blame. The government proposes up to 14 years for intentional conduct, 10 years for reckless conduct and two years for grossly negligent conduct, with unlimited fines in every category, including for companies. It is also “considering whether a higher maximum penalty, including life imprisonment, should be available” where conduct causes or risks loss of life or serious harm to national security.

Today the main law is the Submarine Telegraph Act 1885, which the White Paper says refers only to “telegraphic” communications. The current maximum for negligent damage under that Act is three months. The National Security Act 2023 allows life sentences for sabotage, but only where a link to a foreign power can be proven.

Supplementary offences, each carrying up to two years, could cover obstructing repairs, failing to preserve vessel data and failing to respond to law enforcement. The paper also proposes defences for actions taken to save life or a vessel, and for accidental damage during repair work, but only where “all necessary precautions” were taken. It says the offence must be designed “so as not to inadvertently capture legitimate maritime, scientific and commercial operations”.

Duties, directions and sensing rules

Subsea telecoms cable providers would face legal duties to identify and manage risks, building on the existing telecoms security rules in the Communications Act 2003. The White Paper says voluntary arrangements alone “are not providing sufficient assurance”. A “designated regulator”, not yet named, would monitor and enforce the duties.

A new power would let the Secretary of State direct cable providers, and companies that repair cables, “to take (or refrain from taking) specified actions” when national security is at significant risk. The White Paper says a direction could include prioritising repairs, or delaying repair “where immediate action would prejudice investigation or attribution”.

Fibre-optic sensing, which turns a cable into a sensor that can detect activity at sea, would also be regulated. Those controlling the fibre would have to notify the government, which could impose conditions or, in exceptional cases, ban a deployment.

Why the government says it is acting

DCMS says the cables carry “around 99% of our international data” and that undersea pipelines provide 74% of the UK’s gas supply. It points to “suspicious Russian activity in UK waters”. The White Paper’s foreword says the Defence Secretary revealed in April that UK forces and allies “tracked Russian submarines whose mission was to survey cables”.

“Undersea cables are the hidden backbone of modern Britain,” said Telecoms Minister Ian Murray. Security Minister Dan Jarvis said: “Those who deliberately or recklessly damage our undersea infrastructure will face tougher penalties, including longer prison sentences and unlimited fines.”

The consultation asks for views particularly from infrastructure owners, “maritime and fishing organisations” and sensing technology providers, and includes a cost impact survey for businesses.

DCMS also says the UK network is “highly resilient” and that faults are mostly caused by “accidents involving anchors or trawler nets”, environmental hazards or technical failures.

The biggest change may fall on careless ships, not saboteurs

The 14-year figure grabs attention, but the government’s own account of why cables break points elsewhere. DCMS says faults come from anchors, trawler nets, environmental hazards and technical failures. Most of those cases involve no intent at all, which is why the reckless and grossly negligent tiers matter.

Moving from a three-month maximum for negligent damage to two years, with unlimited fines that also apply to companies, raises the stakes for ship operators and fishing businesses. That is why the consultation singles out maritime and fishing organisations, and why the White Paper itself warns against catching legitimate maritime, scientific and commercial work. Where that line falls will decide how many ordinary operators are exposed.

For compliance teams at shipping firms, the practical risk sits in the supplementary offences as much as in the headline ones. Failing to preserve vessel data or to respond to law enforcement could carry up to two years on its own. The proposed defences depend on showing that all necessary precautions were taken, so record-keeping on board would become part of any defence.

Cable owners would answer to a regulator and to ministers

The second half of the plan changes life for the companies that own and fix cables. The White Paper’s judgement that voluntary arrangements fall short leads to enforceable duties, a regulator with monitoring powers and a direction power that reaches repair providers as well as owners. That is a shift from cooperation to obligation.

The power to delay a repair while an incident is investigated is the sharpest edge. For a cable operator, a delayed repair means a longer outage, and the White Paper sets no figure on what such directions or the new duties would cost. The government’s cost impact survey shows that the price of compliance is still an open question.

This matters for new projects as well as existing ones. Cables such as the planned Pisces link between Ireland and southern Europe and repair efforts like Vocus’s plan for its Perth-to-Singapore cables show how much depends on ship availability and repair timing. TSN has also covered how cable landing stations are chosen. A UK direction power would add a national security layer to those decisions.

What happens next

Responses are open until 11:59pm UK time on 14 January 2027. The government says the feedback “will inform further development of the proposals and any future legislation”. It has given no date for a bill. Until one passes, the 1885 Act and its three-month maximum remain the law for most damage that cannot be tied to a foreign power.