Key Takeaways
- New Zealand’s undersea internet and power cables face rising international threats, prompting a government review.
- A nine‑page report concluded the country is “generally well set up” but identified two gaps requiring partner action.
- Ten “no‑cost, low‑effort” initiatives were proposed; eight are already in progress or completed.
- Recent actions include a simulated cable‑break exercise (10 Mar), a biannual threat assessment (mostly redacted), and a trial national surveillance‑warning system.
- Industry feedback suggests losing a single international cable would have little impact due to built‑in redundancy and traffic rerouting.
- Multiple‑cable failures, however, could disrupt overseas web access and strain the North Island’s electricity supply via the Cook Strait link.
- The most effective long‑term hedge is expanding and geographically diversifying critical underwater infrastructure (CUI).
- A new US‑NZ cable would cost roughly $1 billion; operators seek a strong government protection regime to safeguard such investments.
- Outstanding initiatives involve implementing an Automatic Identification System (AIS) ship‑tracking tool and formalising surveillance for suspicious vessel behaviour.
- Existing cable protection zones and penalties apply unevenly, while a Fiji‑based repair vessel stands ready under a Pacific marine‑maintenance agreement.
Background and Government Response
Assistant Transport Minister James Meager requested “no‑cost, low‑effort” options after growing international threats highlighted vulnerabilities in undersea internet and power cables. The request followed a National Security and Intelligence Minister Christopher Luxon‑ordered review of critical underwater infrastructure (CUI), which warned that submarine cables had become attractive espionage targets. Meager’s ask led to a nine‑page government report outlining ten initiatives designed to bolster protection without significant financial or operational burden.
Assessment of Current Preparedness
The report judged New Zealand “generally well set up” compared with international best practice. Existing measures—such as cable protection zones, penalties for encroachment, and a marine‑maintenance agreement with a Fiji‑based repair ship—provided a solid foundation. Nevertheless, the evolving threat landscape meant that further steps were needed to address the most pressing weaknesses.
Ten Initiatives Overview
Of the ten proposed actions, eight were already underway or completed by March 2026. These included a simulated data‑cable break exercise, a biannual threat assessment, and the trial of a national surveillance‑warning capability. The two remaining initiatives depended on external partners: implementing an Automatic Identification System (AIS) for ship tracking near cables and establishing a formal process for monitoring suspicious vessel behaviours.
Simulated Cable‑Break Exercise
On 10 March, officials conducted the first exercise simulating a break in an international data cable. The drill aimed to test response coordination, traffic rerouting procedures, and communication protocols among cable operators, government agencies, and emergency services. Outcomes fed into refinements of contingency plans and highlighted areas where inter‑agency cooperation could be tightened.
Threat Assessment Process
A biannual threat assessment was instituted to keep abreast of emerging risks. In the report submitted to Meager, most of the assessment was redacted, leaving only references to fishing activity, anchor damage, and earthquakes as the likeliest threats. Officials presented the inaugural assessment to the minister in October of the previous year, indicating that the process is operational but still requires greater transparency for stakeholders.
National Surveillance‑Warning Capability
One‑third of the ten initiatives involves establishing a national surveillance‑warning system designed to detect anomalous activity near cables. A trial of this capability ran successfully late last year, demonstrating the ability to flag vessels loitering or exhibiting unusual patterns within protection zones. The Ministry of Transport (MOT) paper asked Meager whether to transition from trial to a full‑scale rollout, weighing costs against the demonstrated benefits.
Industry Perspective on Cable Redundancy
Feedback from cable operators indicated that losing any one of the five existing international cables would likely go unnoticed by end‑users. This resilience stems from built‑in spare capacity and cooperative traffic‑rerouting agreements among providers. Consequently, single‑cable failures are viewed as low‑impact events, though they still trigger maintenance and repair mobilisations.
Impact of Multiple‑Cable Losses
The report cautioned that the situation changes dramatically if more than one cable is compromised. Citing Iceland’s “Iceland Unplugged” exercise—where all four of the island’s telecom links to Europe were severed—the analysis noted that the primary effect would be overseas web pages failing to load, reducing productivity. For New Zealand, a similar multi‑cable loss could impede access to international services and disrupt businesses reliant on constant connectivity.
Electricity Supply Vulnerabilities
Beyond data, the Cook Strait power cables—supplying up to 30 percent of the North Island’s electricity during peak demand—pose a significant risk. A prolonged outage of these links could “seriously impede” national power supply, drive up wholesale prices, and strain the grid during high‑consumption periods. The report underscores that protecting these cables is as vital as safeguarding data links.
Strategic Hedge: Expanding and Dispersing CUI
The most effective long‑term defence against disruption, according to the report, is to increase the amount of critical underwater infrastructure and spread it geographically. More cables, especially those following divergent routes, reduce the probability that a single incident—whether accidental or malicious—will cripple national connectivity or power flow.
Investment Incentives and Government Role
Plans are already advancing for a new US‑NZ cable estimated at roughly $1 billion. Industry stakeholders have signalled that their chief expectation from the government is a robust protection regime that guarantees the security of such large‑scale investments. Encouraging further cable deployment is viewed as “working well,” with one new international cable already under construction and another in advanced planning stages.
Outstanding Partner‑Dependent Actions
Two initiatives remain pending due to reliance on external partners. First, the deployment of an Automatic Identification System (AIS) would enable cable operators to monitor vessels approaching protection zones in real time, facilitating timely warnings or interventions. Second, a framework for surveilling “suspicious vessel behaviours” needs clarification—specifically, what constitutes suspicious activity, how data will be collected, and which agency will oversee analysis and response.
Existing Protective Measures
New Zealand already enforces cable protection zones and associated penalties intended to deter mariners from entering restricted areas. However, these zones do not yet cover all cables uniformly, leaving some segments less shielded. In the Pacific region, a marine‑maintenance agreement guarantees that a cable‑repair vessel based in Fiji is either laying new cable or on standby to respond swiftly to breaks, providing an essential rapid‑recovery layer.
Conclusion and Outlook
While New Zealand’s current infrastructure enjoys a degree of redundancy and proactive management, the evolving threat environment necessitates continued vigilance. Completing the partner‑dependent initiatives—AIS tracking and formalised suspicious‑behaviour surveillance—will close the remaining gaps. Simultaneously, pursuing geographic diversification of cables and securing strong governmental assurances for future investments will enhance resilience against both accidental damage and intentional sabotage, ensuring the nation’s undersea lifelines remain robust in an increasingly uncertain world.