The Invisible Target That Could Turn Off the World: The Underwater Shadow War

The undersea network is far older than the modern internet. The first transatlantic telegraph cable was laid in 1858. For over a century, cables carried telegraph and telephone traffic across the oceans. The modern era began with fiber-optic cables in the late 1980s. They could carry vast data, and the network has expanded alongside global internet demand.

For most of that period, telecom carriers owned the cables. They typically worked in consortiums to share the enormous cost of laying a single line across an ocean floor. A new transoceanic cable can cost hundreds of millions of dollars.

That ownership picture has shifted heavily toward big technology companies. Analysis indicates that companies like Google, Meta, Microsoft, and Amazon now have significant stakes in dozens of subsea cables globally. The share of international subsea capacity used by these major firms rose from roughly 10 percent in the early 2010s to over 70 percent by 2024. The entities that run search engines and cloud computing now own much of the physical infrastructure their services travel through.

The physical vulnerability of this global grid has never disappeared. At its core, a fiber-optic cable on the seabed is a bundle of glass strands inside protective layers. It can be severed by a trawler's net, a dragged anchor, a volcanic eruption, or a deliberate act. A single dragging anchor can cut several cables at once, which is especially dangerous at global chokepoints like the Red Sea or the Malacca Strait.

The repair system that maintains this worldwide grid is remarkably small. Researchers count a global fleet of about 60 cable-laying and repair vessels. Fewer than 20 of those are dedicated to immediate repair, and many are approaching the end of a 40-year service life. A repair requires a ship to steam to the site, grapple the cable off the seabed, and splice in a new section. The entire job can take weeks, depending on the weather, ocean depth, and the location of the nearest vessel.

Several recent global incidents turned this engineering concern into a worldwide security story:

i. Tonga (January 2022): A massive volcanic eruption severed the sole undersea cable connecting the Pacific nation to the world, plunging the country into a digital blackout and highlighting the lack of redundancy in remote regions.

ii. Taiwan (February 2023): Two cables serving the Matsu Islands were cut within days of each other. Taiwanese authorities attributed the cuts to Chinese civilian vessels but stated there was no direct evidence of deliberate sabotage.

iii. Baltic Sea (October 2023 to Late 2024): The Balticconnector gas pipeline and several nearby telecom cables were severed. Investigators linked the damage to dragging anchors from Chinese and Russian-linked vessels.

iv. Red Sea (February 2024): Four cables were severed globally disrupting Europe-to-Asia data. The widely reported cause was the anchor of the Rubymar, a cargo ship struck by Houthi missiles that later sank.

v. West Africa (March 2024): Multiple major undersea cables failed simultaneously off the coast of West Africa, causing severe internet outages across a dozen countries. The cause was largely attributed to subsea seismic activity, exposing the extreme fragility of regional digital economies.

Through 2025 and into 2026, global alarm has increasingly centered on specialized vessels loitering near critical infrastructure, setting the stage for the current geopolitical debate.

1. NATO and Western governments

   i. The pattern is too clustered to ignore, requiring defensive action.

   NATO and allied nations point to a sudden concentration of cable cuts in highly contested regions. Many incidents involved vessels linked to strategic rivals operating near critical infrastructure during times of conflict. In their view, this is a pattern responsible governments must address. Initiatives like NATO's maritime surveillance missions utilize frigates, patrol aircraft, and naval drones to monitor the seabed. The alliance frames this globally as deterrence of damage to civilian infrastructure, not as military escalation.

   ii. The intelligence threat to cables is real and specific.

   Western officials make an evidence-based case regarding adversarial seabed capabilities. Naval intelligence frequently reports on deep-sea research directorates that operate specialized vessels capable of reaching extreme depths. These vessels carry submersibles and robotic arms capable of tapping or cutting cables anywhere in the world. Western governments argue that mapping and shadowing global cables in peacetime is a clear warning sign.

2. Russia

   i. Accusations are unproven, and accidents are the statistical norm.

   The Russian government argues that no international court has proven it ordered any cable cut. They rely on the cable industry's own global data showing that accidents cause the vast majority of faults. Russian officials routinely dismiss blame as absurd, arguing that Western nations attribute every undersea problem to Moscow without grounds. This stance is sometimes bolstered by Western reports acknowledging that inexperienced crews on poorly maintained global shipping vessels often cause these faults accidentally.

   ii. Rejection of the hybrid-war premise.

   Russia argues it has no rational interest in destroying civilian cables that it also relies upon for global connectivity. Moscow characterizes Western surveillance of its commercial and research vessels in international waters as a provocation, frequently redirecting accusations of sabotage toward other nations or actors.

3. China

   i. Compliance with international law and willingness to cooperate.

   China's primary defense is procedural. Following incidents involving Chinese-flagged vessels, Beijing consistently states its readiness to establish the facts with relevant international bodies. China emphasizes that it fulfills its obligations as a flag state and requires its global shipping fleet to obey maritime law. They often point to independent inquiries that fail to find conclusive evidence of state-directed deliberate damage.

   ii. The reality of congested global shipping lanes.

   Regarding incidents in the Asia-Pacific, China notes that vessels of every nation occasionally damage cables by accident. The waters around Taiwan and the South China Sea are among the most congested shipping lanes on Earth. In this framing, singling out Chinese ships reflects political tension rather than objective proof of malicious intent.

4. The cable industry and neutral experts

   i. Faults are routine, and rushing to claim sabotage is misleading.

   The industry's strongest point is that cable breaks are ordinary engineering events globally. With roughly 200 faults occurring every year for over a decade, severing a handful of cables is statistically normal. The industry stresses that media attention can make routine incidents look highly suspicious. Experts frequently invoke the principle that one should not attribute to malice what poor seamanship and bad luck can easily explain.

   ii. The real solution is global resilience, not geopolitical blame.

   Neutral experts argue the most productive response is hardening the global system. This requires funding diverse cable routes, improving seabed burial techniques, and expanding fast repair capacity globally. An accident and an act of sabotage require the exact same time and money to repair. The practical priority is building a larger repair fleet and strengthening international maritime rules.

1. Of NATO and Western governments

   i. Public rhetoric frequently outpaces concrete evidence.

   Critics argue that public statements from Western governments often run ahead of proof. Private judgments by allied officials sometimes concede that heavily publicized faults were likely accidents caused by poor seamanship. The risk is that overstating attribution feeds unnecessary global escalation and erodes institutional credibility when a genuine, undeniable case of sabotage finally arrives.

   ii. The protection effort exposes physical limitations.

   The Western response exposes an uncomfortable logistical reality. Patrolling vast global oceans with a handful of military vessels and drones cannot physically guard every meter of cable. The world relies on an aging commercial repair fleet, and military surveillance missions do nothing to fix a severed line. Critics argue that governments reach for visible military responses while neglecting the slower work of funding civilian repair ships.

2. Of Russia

   i. Denials conflict with a documented pattern of suspicious activity.

   The case against Russia's position starts with global vessel tracking. The documented conduct of specialized intelligence ships loitering near critical transatlantic and European cables is difficult to square with pure coincidence. Western governments draw a firm conclusion from this record. Even if individual cuts are not proven as explicit orders from Moscow, the deliberate surveillance activity is inherently threatening.

   ii. The reliance on a "shadow fleet" is a deliberate risk.

   To evade international sanctions, heavily utilized fleets of poorly tracked and poorly maintained tankers navigate the globe. This reliance creates the exact conditions in which cables are accidentally destroyed by dragging anchors. Critics argue that even under an accident theory, the deployment of substandard global shipping fleets makes the operators responsible for the resulting infrastructure damage.

3. Of China

   i. Cooperation is often slow and tightly controlled.

   Critics of China's handling of maritime incidents point to friction beneath their cooperative diplomatic language. In multiple global investigations, weeks have passed before international investigators were allowed access to vessels, and often only as observers of Chinese-led inquiries. Critics argue that a lack of conclusive evidence often reflects the severe limitations placed on independent investigations.

   ii. Gray-zone tactics in contested regions.

   Regarding the Asia-Pacific, analysts argue that cable cuts cannot be read in isolation from broader military and economic pressure campaigns. Even without proof of direct orders, these incidents fit a pattern of gray-zone operations. These actions fall below the threshold of open conflict but successfully degrade a target's connectivity and test regional response capabilities.

4. Of the cable industry and neutral experts

   i. The assumption of routine accidents breeds complacency.

   The industry's measured, data-driven stance draws its own criticism. The historical base rate of accidental faults could easily lull global governments into underreacting to a genuine shift in threat levels. Critics argue that if state actors are now willing to use the cover of routine maritime accidents to conduct deliberate infrastructure sabotage, the comforting statistics of the past decade no longer describe the threat ahead.

   ii. Private ownership leaves a global infrastructure unprotected.

   Critics fault the very structure of the modern internet infrastructure. A few massive technology companies and private consortiums own the world's most critical communications grid, yet the repair fleet is tiny and aging. There is no central global authority whose mandate is to guarantee the network's security as a public infrastructure. The objection is that global resilience currently depends entirely on commercial profit incentives, which fail to match the strategic stakes of international security.