Three Chokepoints in One System: How Redundancy Became the Middle East's New Vulnerability
09/13/26
Author: The Security Nexus, LLC. Estimated read time: 10 min Read in isolation, today's news is a single, unattributed incident: UKMTO reports a projectile struck a vessel transiting the Strait of Hormuz, starting a fire and forcing an evacuation, with Iranian state media saying one crew member died and three were injured (Reuters 2026; Anadolu Ajansı 2026). Read against the last six months, it is the latest data point in something considerably larger — and the framing that matters is not "what happened today" but "what happened to the workarounds." That distinction is worth making explicit, because it's easy to mistake this week's news for the opening act of a crisis. It isn't. The Strait of Hormuz has already been the site of the largest single energy-supply disruption in the history of global oil markets, and that happened in late February and early March of this year — not this week. What's new since September 8 is not that Hormuz is dangerous; it's that the redundancy the region built specifically to manage that danger is now failing in parallel, at multiple points, more or less simultaneously.
The First Shock Was Already Historic In the final days of February 2026, joint US-Israeli strikes on Iranian territory killed Supreme Leader Ali Khamenei (Ushakov 2026, 2). Iran's Islamic Revolutionary Guard Corps responded by announcing the closure of the Strait of Hormuz to shipping affiliated with hostile powers — and then, over the following days, made that closure operationally real rather than merely declared, striking tankers including the Prima and the Stena Imperative with drones and missiles (Ushakov 2026, 2). By the first week of March, major shipping operators had suspended transit through the Strait entirely, war-risk insurance premiums had spiked to roughly 0.7 percent of hull value per transit, oil prices had jumped from below $70 a barrel to above $120 before settling near $90, and Kuwait, Saudi Arabia, and the UAE all faced reduced production because storage facilities were filling with crude that had nowhere to go (Ushakov 2026, 2–3). Independent quantitative work on the closure puts the scale in stark terms: roughly 20 million barrels per day of crude transit disrupted, the largest supply shock in recorded oil-market history, with global GDP losses across blockade-duration scenarios estimated at $330 billion to $2.2 trillion depending on how long the closure persisted (Lee et al. 2026). One vulnerability-index study identified Bangladesh, Pakistan, and several Southeast Asian economies as facing the most severe combined energy, food, and economic stress from the closure — a reminder that Hormuz disruption is not primarily a Western gas-price story (M. B et al. 2026). That crisis eased, but it did not resolve. Legal scholar Mark Nevitt, writing in the months after, described a Strait that remained "an active conflict zone" with Iranian forces continuing to strike neutral merchant vessels and reportedly laying naval mines — an escalation he judged especially dangerous given the US Navy's recent decommissioning of an entire minesweeper class without an effective replacement (Nevitt 2026). Nevitt's framing is the one worth carrying into September: Hormuz's geography is a textbook case of asymmetric warfare favoring Iran, where "a naval mine or drone costing thousands can cause billions of dollars in economic or physical damage," and "the mere perception of such a threat is enough to shut the Strait down indefinitely" (Nevitt 2026). Regional planners spent the intervening months betting on exactly the bypass infrastructure that is now, this week, coming under direct attack.
What Actually Changed This Week Three things happened in quick succession between September 8 and September 13, and it's the sequencing, not any single event, that constitutes the news. First, the underlying US-Iran conflict that produced the spring closure reignited at sea: Reuters and multiple outlets reported the biggest wave of tanker attacks since the war began, with US and Iranian forces trading strikes on shipping and Iran claiming attacks on ten vessels after US strikes on Iranian tankers (Reuters 2026b; Al Jazeera 2026a). Second, a drone attack forced Saudi Arabia to shut down its East-West Pipeline — the Kingdom's principal bypass route around Hormuz, carrying an estimated 4–5 million barrels per day to the Red Sea, and one of the small handful of alternative routes (alongside Iran's Jask port, the Iraq-Turkey Kirkuk-Ceyhan line, and the UAE's Abu Dhabi Crude Oil Pipeline) that the academic literature on this crisis treats as the region's real relief valves (Bahgat 2026). Baghdad and Riyadh have said the drone originated in Iraq; the Los Angeles Times reported the attack "blamed on Iran-backed militias in Iraq," while Anadolu Ajansı's reporting frames it as still under joint Iraqi-Iranian investigation — worth noting as a live discrepancy rather than a settled fact (Los Angeles Times 2026; Anadolu Ajansı 2026b). President Trump said Iran was "probably" responsible, a characterization multiple outlets reported without accompanying released evidence (CNN 2026; Haaretz 2026). Third, and separately, Houthi forces completed their advance down the Yemeni coast to seize Perim Island, the small volcanic island that sits inside the Bab el-Mandeb strait and effectively commands the narrowest shipping lane between the Red Sea and the Gulf of Aden (Reuters 2026c; New York Times 2026). CNN's own reporting on the fallout inside US and allied planning circles was blunt enough to quote officials calling the Houthi advance "a f***-up of epic proportions" (CNN 2026b). None of these three events required the others to happen. That is precisely the point.
Why "Redundancy" Was Always a Qualified Word The academic literature on Hormuz written in the aftermath of the spring closure was already skeptical that meaningful redundancy exists in this system, and September's events are close to a live demonstration of the argument. Bahgat (2026), surveying the alternative routes in detail, concluded that the postwar Gulf order was unlikely to be a clean binary of "unrestricted navigation or full Iranian control," and that a more realistic baseline was "partial restrictions, negotiated passage, and episodic disruptions" running through all of the bypass infrastructure simultaneously — which is a fair description of where the region sits this week, six months later. A 2026 conceptual framework paper on chokepoint theory makes the mechanism explicit: Hormuz's defining feature is "the near-absence of a short-term substitute, which disables the rerouting strategies that contained earlier disruptions," and — critically for this week's news — "the duration of an interruption, rather than its onset, governs whether the disruption is absorbed or becomes transformative" (Meier 2026). Every additional bypass route that goes offline shortens the runway before an interruption crosses that threshold. The Saudi pipeline's importance is precisely that it was one of the few pieces of that rerouting capacity actually available at scale — Pratson's (2022) prior mapping of global chokepoint interdependence found that Hormuz sits among a small set of chokepoints (alongside the Danish Straits, the Bosporus, and the South China Sea corridor) whose closure produces measurable trade diversion through alternate routes, precisely because alternate routes exist to divert traffic to. Knock out the pipeline that was absorbing 4–5 million barrels per day specifically so it wouldn't have to transit Hormuz, and that diversion capacity doesn't reroute elsewhere — it simply disappears. The Bab el-Mandeb seizure compounds this in a different way: it isn't a bypass route being closed, it's the alternate corridor itself (the Red Sea route north of the Gulf, already under Houthi pressure since 2023-2025) coming under more direct control by the same axis of actors contesting Hormuz. A 2026 study modeling the Strait of Hormuz alongside Bab el-Mandeb explicitly, published shortly before this week's events, argued the two chokepoints "must be viewed as part of a larger maritime-security framework" rather than independent risks, and that their combined disruption potential "reveal[s] vulnerabilities in the globally integrated supply chain" well beyond what either chokepoint threatens alone (Shahzad 2026). September is that combined framework being tested in practice rather than modeled in theory.
Attribution Is a Separate Question From Strategic Effect The brief's original framing is worth preserving explicitly, because it's analytically correct and gets lost when every incident is reported as a single attributed act: Iran does not need to control the pipeline drone, the anonymous Hormuz projectile, and the Houthi advance on Perim Island as a coordinated operation to benefit from all three occurring together. UKMTO has not identified an attacker in today's strike. The Iraq-origin claim for the pipeline drone remains, per Anadolu Ajansı's reporting, still under joint investigation rather than confirmed. Trump's "probably Iran" attribution was offered without released evidence, per CNN and Haaretz's own framing of the remark. Nevitt's point about asymmetric warfare applies here at the level of strategic architecture as much as at the level of a single mine: a fragmented set of actors — Iranian forces, Iran-aligned militias in Iraq, and the Houthis, each with their own command structure and their own reasons for acting — can degrade the same export architecture in parallel without any of them needing to coordinate, and the resulting uncertainty about who did what is itself strategically useful to Tehran regardless of how much operational control Tehran actually exercised over any single strike. Treating attribution and strategic effect as separate questions, rather than assuming the answer to one settles the other, is the more defensible analytic posture here — and it's also the one the available reporting actually supports, since none of the three September events has a fully confirmed attribution as of this writing. The System-Level Reading Zoom out, and the three-chokepoint framing understates the situation in one respect: this is not three independent single points of failure sitting inside an otherwise-redundant system, waiting for someone to test each one separately. It is a system that was already stress-tested to its historical limit six months ago, whose recovery depended on distributing risk across a small number of bypass routes and secondary corridors, and which is now watching that distributed capacity get eroded from multiple, uncoordinated directions in the same week. Bahgat's prediction of an indefinite state of "partial restrictions, negotiated passage, and episodic disruptions" (2026) reads less like a forecast now than like a description of the present. The open question for the region's energy security — and the one worth returning to as this develops — is whether "episodic" still describes a system where the episodes are now arriving from three directions at once. SOURCES Al Jazeera. 2026a. "Why US-Iran War Over Hormuz Is Threatening the Gulf's Waters." September 9. https://www.aljazeera.com Anadolu Ajansı. 2026a. "Fire Breaks Out on Vessel After Projectile Strike in Strait of Hormuz: UKMTO." September 13. https://www.aa.com.tr Anadolu Ajansı. 2026b. "Iraq, Iran Discuss Probe Into Drone Attacks on Saudi Oil Pipeline." September 13. https://www.aa.com.tr Bahgat, G. 2026. "Crisis in the Strait of Hormuz: What Lies Ahead?" Middle East Policy. https://doi.org/10.1111/mepo.70083 CNN. 2026a. "Trump Says Iran Likely Responsible for Attack That Shut Vital Saudi Oil Pipeline." September 12. https://www.cnn.com CNN. 2026b. "'A F***-Up of Epic Proportions': Blame Game Begins After Iran-Backed Houthis' Lightning Advance Down Red Sea Coast." September 12. https://www.cnn.com Haaretz. 2026. "Trump Says Iran 'Probably' Behind Attack on Saudi Pipeline." September 12. https://www.haaretz.com Los Angeles Times. 2026. "Attack on Key Saudi Pipeline Is Blamed on Iran-Backed Militias in Iraq." September 12. https://www.latimes.com Lee, Seung-Jun, et al. 2026. "How Sustainable Is Arctic Route Diversification? Economic Losses, SDG Trade-Offs, and Supply Chain Resilience in the 2026 Hormuz Crisis." Sustainability 18 (9): 4318. https://doi.org/10.3390/su18094318 M. B, et al. 2026. "Crude Disruption: Wartime Supply Chain Collapse in the Strait of Hormuz and Its Cascading Human Consequences." 2026 International Conference on Emerging Trends in Mobile Computing and Sustainable Informatics (ICEMCSI). https://doi.org/10.1109/icemcsi67638.2026.11603201 Meier, Sarah. 2026. "Non-Substitutable Chokepoints and Global Supply Chain Disruption: A Conceptual Framework and Scenario Analysis of a Strait of Hormuz Closure." Unveiling Seven Continents Yearbook Journal. https://doi.org/10.65326/u7y566830 Nevitt, Mark. 2026. "Legal and Operational Issues in the Strait of Hormuz: Transit Passage Under Fire." SSRN Electronic Journal. https://doi.org/10.2139/ssrn.6422118 New York Times. 2026. "Houthis Seize a Key Red Sea Island, Threatening Another Global Oil Route." September 11. https://www.nytimes.com Pratson, L. 2022. "Assessing Impacts to Maritime Shipping From Marine Chokepoint Closures." Communications in Transportation Research 2: 100083. https://doi.org/10.1016/j.commtr.2022.100083 Reuters. 2026a. "New Report of Attack on Strait of Hormuz Shipping Fans Fears of Threats to Oil Supplies." September 13. https://www.reuters.com/business/energy/new-report-attack-strait-hormuz-shipping-fans-fears-threats-oil-supplies-2026-09-13/ Reuters. 2026b. "Iran and US Hit Tankers in Biggest Wave of Attacks on Shipping Since War Began." September 9. https://www.reuters.com Reuters. 2026c. "Gulf Oil Threatened Anew as Houthis Reach Key Island and Pipeline Is Shut Down." September 11. https://www.reuters.com Shahzad, Shahbaz Ahmed. 2026. 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