Subsea Cable Security: AI, Hyperscalers, and the Modern Strategic Imperative

For decades, the vast network of subsea cables crisscrossing the ocean floor operated largely unnoticed. These cables, the essential infrastructure of the internet, were considered reliable, if unglamorous. That era is over. Today, subsea cables are recognized as strategically vital assets, attracting attention from governments, hyperscale companies, and increasingly, those with malicious intent. A confluence of factors – surging data demand driven by artificial intelligence (AI), the evolving role of hyperscalers, and growing geopolitical tensions – is reshaping the subsea landscape and forcing a reassessment of security priorities.

The Rise of AI and Bandwidth Demand

The global subsea systems market is projected to experience significant growth, estimated at approximately $4 billion over the next four years [1]. This expansion is fueled by the increasing adoption of cloud services, the expansion of hyperscale data centers, and, critically, the bandwidth-intensive demands of AI workloads. As AI applications become more prevalent, the require for high-capacity, low-latency connectivity will only intensify, placing further strain on existing infrastructure and driving investment in new cable systems.

Hyperscalers Accept Control

A significant shift is underway in the subsea cable industry: hyperscalers are no longer simply customers leasing bandwidth. They are actively becoming investors, designers, and even owners of subsea infrastructure [1]. Companies like Amazon Web Services (AWS) are directly investing in new cables, such as the Fastnet cable connecting the US and Ireland [3]. This move represents a fundamental change in the industry dynamic, with hyperscalers seeking greater control over their connectivity and potentially reshaping the roles of traditional network operators.

Ana Nakashidze, CEO at AzerTelecom, notes that this shift could diminish the role of traditional carriers as hyperscalers drive investment and dictate maintenance and infrastructure agendas [1]. However, she also cautions against overinvestment based on potentially inflated AI demand forecasts, emphasizing the need for disciplined capital allocation.

Security Concerns Escalate

The increasing strategic importance of subsea cables has brought security concerns to the forefront. The 2024 incident in the Baltic Sea, where a Chinese-flagged vessel damaged key cables, serves as a stark reminder of the vulnerability of this critical infrastructure [1]. This event highlighted the risk of “persistent grey-zone risk,” where repeated damage incidents necessitate increased scrutiny of cable routes and landing stations.

Physical security of cables and cybersecurity of landing stations are now considered front-line concerns [1]. Hybrid conflict scenarios are driving preventative and deterrent measures at the national level. Beyond deliberate interference, cables are susceptible to accidental damage from human activities like fishing and anchoring, with an average of 150 to 200 cable faults occurring annually.

Resilience Gaps and Repair Challenges

The subsea cable industry faces a growing resilience gap, particularly in repair capabilities. There is a shortage of specialized cable ships, spare parts, and experienced personnel [1]. Carl Grivner, CEO at FLAG, directly states that there are currently insufficient ships to address potential widespread outages, and a short-term resolution is unlikely [1]. The ability to withstand multiple, correlated failures is a key concern, as most networks can survive a single cable cut, but not a cascade of them.

Technological Advancements in Monitoring

New technologies are enhancing cable capabilities and security. Distributed acoustic sensing (DAS) and AI-enabled fault detection are transforming subsea cables from passive conduits into active monitoring tools [1]. These advancements provide real-time monitoring and sensing functions, adding a layer of operational visibility for both operators and governments.

The Need for Coordination

Despite technological advancements, the central challenge remains coordination. Effective resilience requires collaboration between governments and private operators, across national regulatory frameworks, and among competing commercial interests [1]. The subsea sector is expanding rapidly, but governance structures, repair resources, and cross-border response mechanisms are not keeping pace with the investment flowing into it.

As stated in a recent industry report, securing subsea cables requires a combination of technical controls, organizational readiness, and cross-border cooperation, mirroring the approach taken for other categories of critical infrastructure [1].