The United States can detect sabotage of undersea cables, but it has no plan to repair them in wartime

1. What the analysis claims about Svalbard and why Washington is watching

According to War on the Rocks, in spring 2026 the United Kingdom, Norway and the United States disrupted a Russian exercise that simulated taking out two undersea cables of 1,400 kilometers leading to Svalbard.

The publication writes that Russian deep-sea submersibles repeated, off the coast of Norway, the deployment of a device designed to disable the two cables linking Svalbard to the mainland. The publication writes that the United Kingdom, Norway and the United States monitored the operation and disrupted it. There is no public data on the exact date, the vessels involved, or how the exercise was disrupted.

The American stake is concrete. The same source states that a terrestrial satellite station operates on Svalbard serving Europe, the United States and Japan. If the cables were cut, part of the data downlinked from satellites through this station would have to be rerouted by other means or would remain blocked until repair.

The authors draw a dual conclusion from the episode. The good news: NATO allies can detect a hidden undersea operation and stop it if they catch it in time. The bad news: detection does not answer the question that matters after a successful attack — who repairs the cable, how quickly, and what happens if other cables, in other areas, are cut before the first one is restored.

This is the subject of this article. Not the sabotage itself, but the capacity to absorb it.

2. Why one fault is routine, and ten simultaneous ones become a crisis

For this volume, the system works. The source estimates that there are about 22 ships in the world equipped to repair undersea cables. While one cable is under repair, operators shift traffic to other routes. The ordinary user notices nothing, because the network has enough detour paths.

The problem arises when faults are no longer independent of one another. Accidents are spread out in time and space; a deliberate campaign can concentrate them. A fleet sized for random failures is not sized for a coordinated offensive across multiple theaters.

The last row is the one that matters for Washington. In peacetime, repair order is set by contracts between cable owners and repair firms. In wartime, someone would have to choose between a cable carrying banking traffic, one carrying military traffic, and one linking a satellite station.

3. The mechanism: the attacker wins if it cuts faster than repairs can be made

The causal chain proposed by War on the Rocks has four links. We reconstruct them below and note, for each, how solid the available evidence is.

The links of the chain

First link: repair capacity is small and fixed in the short term. The estimate of roughly 22 ships comes from the source, not from an official register consulted here. A repair ship is not built in a few months, so the fleet available at the start of a conflict is, in practice, the fleet one works with.

Second link: an adversary can strike several cables almost simultaneously. The Svalbard exercise, as the source describes it, suggests that dedicated means exist for this. The authors' phrasing is direct: to disrupt global communications, an adversary need only damage cables in several places faster than the repair system can restore them.

Third link: detour routes become exhausted. Rerouting traffic works when one cable fails. When several fail along the same corridor, the remaining capacity may not be enough for all the traffic.

Fourth link: without an authority to set priorities, ships go wherever their contracts send them. The result would be a repair order dictated commercially, not strategically.

The weakest link

The second link is the weakest. The fact that Russia rehearsed, according to the source, attacks on two cables does not prove a capacity to strike dozens of cables across several oceans within the same interval. The documentation contains no data on the number of submersibles available, their range, or the rate at which they could operate.

If the attacker can cut only a few cables a month, the existing fleet might keep pace, and the case for a federal program weakens considerably.

The counter-hypothesis

The main counter-hypothesis: the market solves the problem on its own, because network redundancy is already large. Major cloud and telecom operators have a direct financial interest in not losing customers and would pay for additional routes and priority repairs, without state intervention.

It is less plausible for two reasons. First: commercial redundancy is built for independent faults, not for coordinated strikes on several routes. Second: a private firm cannot resolve the priority conflict between its commercial traffic and government or military traffic; that is, by definition, a public decision.

A second counter-hypothesis: satellites absorb the traffic. The source provides no figures on the satellite capacity available as a substitute, and this article has no other source for it. The argument remains open, but it is not supported by data here.

4. What is missing in Washington and who should decide

War on the Rocks acknowledges one thing done. According to the publication, since 2020 the Federal Communications Commission — the federal authority that licenses cables landing on American territory — has applied strict policies on cable ownership and vendor vetting. The documentation for this article does not include FCC texts, so the claim remains attributed to the source.

These policies concern who builds and who owns the cables. They do not concern who repairs them under fire. The source's central diagnosis is that the United States lacks a wartime repair and restoration strategy for a campaign of simultaneous faults across several theaters.

The authors propose three measures. First: designating undersea cables as critical infrastructure. Second: a federal coordinating authority with emergency powers to set repair order. Third: a larger budget for expanding the Cable Security Fleet.

On the Cable Security Fleet, the source only says it should be expanded with additional funds. The documentation contains no data on the number of ships in the program, their operators, or the current budget, so these details are not asserted here.

The logic of the proposal is simple. The three measures would give Washington, in the authors' framing, a way to decide which cables are repaired first and what ships are needed to carry out those decisions.

The source also recalls a 2017 report from Policy Exchange, signed by Rishi Sunak, later British prime minister, which already warned about cable vulnerability. The original report was not consulted for this article, so we do not use it as evidence in the argument.

5. The Arctic route bypasses the Red Sea and enters the exercise waters

Part of the response to vulnerability is building new routes. Northern research networks plan, according to the source, the Polar Connect cable, roughly 10,000 kilometers, from Sweden across the Arctic Ocean to Japan and North America.

The route is conceived as an alternative to the Red Sea passages, a geopolitically exposed corridor. But the planned route passes close to Svalbard, that is, through the same waters where, according to War on the Rocks, Russia recently rehearsed cable disruption.

The authors note that new routes carry additional restoration challenges. The documentation does not detail what these are. A reasonable inference, marked as interpretation: an Arctic route is farther from the ports from which repair ships depart, and weather conditions may limit the working window.

For the United States, the implication is that diversifying routes does not replace repair capacity. A new cable in a disputed area adds redundancy in peacetime and one more target in wartime.

For American cloud and telecom operators, this translates, as interpretation, into higher redundancy costs and possibly insurance costs. The documentation contains no figures on insurance premiums or redundancy expenditure, so the effect is not quantified here.

6. Four scenarios for 2027 and what would rule them out

The dominant scenario is the continuation of the current state: repairs remain in the hands of the commercial fleet, with no federal prioritization authority and no new budget line. The main argument is inertia: the post-election period leaves little legislative space, and the source mentions no bill in progress.

A plausible but less likely scenario is a federal repair-capacity program, with money to expand the Cable Security Fleet in a future defense authorization cycle. It would require the subject to enter the agenda of the new Congress.

A third, less likely scenario is a formalized allied coordination, in which the United States, the United Kingdom and Norway, the three actors in the Svalbard episode, share ships and priorities. The source indicates no negotiations to this effect.

The tail scenario is escalation: real sabotage on several routes and visible outages for users. Severity would be highest, but the documentation contains no signals that it is imminent.

Verification relies on the falsification thresholds in the fourth column, not on the probability labels. A single signed act is enough to rule out the first two predictions.

7. What is fact, what is interpretation, and what is attributed opinion

This article rests on a single substantial source. We therefore explicitly separate three categories and indicate the confidence level for each key claim.

Claims attributed to a single source, not independently verified, with moderate confidence: the Russian exercise near Svalbard and its disruption by the three states; the 1,400-kilometer length of the two cables; the existence of the satellite station serving Europe, the US and Japan; the 150–200 annual faults; the approximately 22 ships; the roughly 10,000-kilometer Polar Connect cable; the FCC policies of 2020.

Attributed opinions, not facts: that the United States has no wartime repair strategy; that cable repair should be treated as a national security mission; the three proposed measures. These are the positions of the War on the Rocks authors.

Interpretations of this article, with low to moderate confidence: identifying the weakest link; assessing the counter-hypotheses; the effects on US operators' costs; the specific difficulties of an Arctic route; the ranking of scenarios.

8. Method, definitions and figures

Undersea cable: a fiber-optic cable laid on the seabed that carries data between continents or between islands and the mainland. Cable fault: an outage or degradation requiring the intervention of a specialized vessel. Repair ship: a vessel equipped to lift, repair and re-lay a cable on the seabed.

Cable Security Fleet: an American program the source cites as an instrument to be expanded; its scope is not described in the documentation and is not described here. Polar Connect: a cable project of northern research networks, in the planning phase, according to the source.

All figures in the article come from the War on the Rocks analysis of 5 November 2026. They have not been compared with official registers of the repair fleet or with industry statistics. There are no derived figures: the article does not divide, average or compute ratios from the source's data, because a single unverified source does not support such calculations.

The probabilities are verbal categories — dominant scenario, plausible, tail — assigned by editorial judgment, based on three criteria: the absence of a mentioned legislative project, the American political calendar, and the absence, in the documentation, of escalation signals. They are not calibrated against a history of similar predictions and should not be read as frequencies. This is the article's only calibration caveat; it applies to all scenarios and rows in the predictions table.

9. Limits of the analysis

The analysis rests on a single external source, and the Svalbard episode, the fleet figures and the claims about the FCC have not been independently confirmed. It cannot say how many cables an adversary could strike simultaneously, nor how quickly they would be repaired in practice, because data on offensive capacity and ship availability is missing.

The diagnosis would be invalidated if an official source showed that the United States already has a repair prioritization plan for conflict, or if a federal coordinating authority were created before 30 June 2027. Reassessment occurs upon publication of the FY2028 defense budget request or any official statement about the Svalbard incident, whichever comes first.