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21 Miles: The Strait That Controls the Global Economy

At its narrowest point, the Strait of Hormuz is 21 miles wide. On one side, the Persian Gulf, home to roughly a fifth of the world's oil supply. On the other, the Gulf of Oman and the open sea. The line that lies in between is the Strait of Hormuz, and for decades the entire architecture of the global energy economy has balanced on top of it.


The navigable shipping lanes occupy only six of those miles: two inbound, two outbound and two miles of buffer between them, threaded between the coastlines of Iran and Oman. To geographers it is a waterway, but to strategists it is the most consequential single point of failure in the global economy.


Analysts had long warned of the consequences if it ever closed. For years, the warning signs had been accumulating. There were naval standoffs, tanker seizures leading to the slow drumbeat of escalating tensions between the powers that surrounded it. The world had come close before, pulling back each time from the edge of the unthinkable. In early 2026, it ran out of chances.


The Past: A History of Threats 

The Strait of Hormuz did not become a strategic liability overnight. Its current importance is a product of deliberate economic decisions made in the decades following World War II. As Western economies industrialized and Asian ones modernized, Gulf oil became the fuel of global growth. The first oil shock of 1973 marked the moment when oil became a macroeconomic variable. Although the strait was not physically closed, the crisis revealed how dependent consuming nations had become on Gulf exports. From that point forward, a disruption at Hormuz no longer threatened marginal supply. It threatened the system itself.


The first proof that the strait could be weaponized came during the Iran-Iraq War. Between 1981 and 1988, Iran and Iraq carried out a combined 451 attacks on merchant vessels in the Persian Gulf and Strait of Hormuz. Iraq's strategic logic was openly coercive: Saddam Hussein, the iron-fisted Iraqi dictator who had launched the war against Iran in 1980, calculated that by targeting Iranian shipping he could provoke Tehran into retaliating with extreme measures, such as closing the Strait of Hormuz, and thereby draw the United States into the conflict.


Iran did not close the strait. But it mined the waters, seized vessels, and demonstrated that a determined state actor could make passage extraordinarily costly. The United States responded with the largest naval convoy operation since World War II. The pattern was established: crisis, intervention, resolution, and a return to the status quo.


That pattern repeated itself for the next four decades. After the Islamic Revolution, threatening to close the strait became a recurring instrument of Iranian statecraft which was deployed in response to sanctions, diplomatic pressure, and military provocation. Iranian military officials stated plainly that "if our oil does not pass, the oil of others shall not pass the Strait of Hormuz either." The threat was credible enough to move markets. It was never credible enough to force structural change.


The late 2010s brought the threats closer to action. The US Navy blamed Iran for a series of limpet mine attacks on tankers in 2019. As well as a fatal drone attack on an Israeli-linked oil tanker in 2021 that killed two European crew members. In June 2019, two oil tankers were struck by explosions near the strait. In April 2024, the Islamic Revolutionary Guard Corps (IRGC) boarded and seized a container ship in the Gulf of Oman. Each incident was treated as an escalation to be managed. None was treated as a preview to be prepared for.


The history of the Tanker War demonstrated that Hormuz could be functionally closed through risk and insurance dynamics, even without a formal blockade. That lesson was documented, analyzed, and set aside. Only Saudi Arabia and the UAE have operating pipelines capable of bypassing the strait, with a combined effective capacity of roughly 3.5 million barrels per day which is a fraction of the 20 million that transit it daily. The world kept funneling its energy supply through a single chokepoint and called it a supply chain. It took until 2026 to discover the cost of that decision.


The Present: The Crisis That Finally Materialized

On February 28, 2026, the United States and Israel launched coordinated airstrikes on Iran, killing their Supreme Leader Ali Khamenei and targeting nuclear sites, military facilities, and senior leadership. Iran responded by launching retaliatory missile and drone strikes against US bases, Israeli territory, and Gulf states hosting American forces. The IRGC simultaneously declared that passage through the Strait of Hormuz would no longer be permitted.


The shutdown was swift and nearly total. Traffic through the strait fell approximately 90%, with hundreds of vessels anchored off the coasts of Saudi Arabia and Iraq. Major carriers including Maersk, MSC, Hapag-Lloyd, and CMA CGM suspended operations and began rerouting around the southern tip of Africa, adding weeks to transit times and significantly raising costs.


Crucially, Iran did not require a conventional naval blockade to achieve this outcome. Several drone strikes in the vicinity of the strait were sufficient to cause insurers to withdraw war-risk coverage. Without that coverage, shipowners were unable to proceed regardless of their willingness to accept physical risk. The closure was, in effect, insurance-driven.


The Energy Shock and Cascading Effects

Iran's IRGC vowed that not a single litre of oil would pass through the strait for the benefit of the US and its allies leading to warning of oil prices reaching $200 per barrel. Brent crude surpassed $126 per barrel at its peak. The IEA announced a record release of 400 million barrels from emergency reserves in response.


The disruption extends well beyond energy. Roughly one-third of global seaborne fertilizer trade transits the strait, raising the prospect of significant food price inflation, particularly damaging given the timing at the start of the Northern Hemisphere planting season. Aluminum, petrochemicals, pharmaceuticals, and the synthetic inputs underpinning the Asian garment industry are all affected. One major Bahraini aluminum producer has already declared force majeure, and Qatar halted LNG production at key export facilities.


India's Exposure

India faces a dual shock. Almost half of its crude oil imports and around 60% of its natural gas supplies move through the strait. Qatar and the UAE together account for 53% of India's LNG imports, and unlike crude oil, there is no comparable alternative source available on short notice. The LPG situation is particularly acute: India imports roughly 60% of its LPG consumption, of which approximately 90% normally transits the strait.


India does hold some buffers. The government reports crude oil and refined product cover of approximately 50 days, and domestic refineries are operating at full capacity. India has also diversified its crude sourcing across roughly 40 countries, with around 70% of imports routed through alternative corridors.


Nevertheless, macroeconomic pressures are building. The Indian crude basket reached $113.57 per barrel as of March 11, up sharply from the $62–70 range that prevailed through much of the prior fiscal year. Analysts warn that sustained prices at $120 per barrel could push the rupee to 97.50 against the dollar or beyond. For a country with a large energy import bill, even indirect price effects carry significant consequences for inflation and household purchasing power.


What This Crisis Reveals

The most important thing to understand about this crisis is that it was not a surprise. The world knowingly concentrated roughly 20% of its daily oil supply through a single narrow waterway and called the arrangement a supply chain. That was never a resilient system. It was a single point of failure, and the world chose to depend on it anyway.


When the strait closed, the mechanism that actually enforced the closure was not military. It was financial. Underwriters in London withdrew war-risk coverage after a handful of drone strikes in the vicinity of the waterway. Without that coverage, shipowners could not proceed. This reveals something important: the true chokepoint was never geography. It was the insurance architecture built around it. Any future strategy for protecting maritime trade must account for this.


The closure also exposed the limits of conventional deterrence. Decades of US naval presence in the Gulf was premised on the assumption that military superiority would guarantee free passage. Iran bypassed that assumption with cheap drones. The lesson is uncomfortable. Asymmetric threats do not need to destroy ships. They only need to destroy confidence.


Perhaps the most revealing dimension of the crisis is how it has affected even Iran's closest partners. China cannot get its own ships through the strait despite being Iran's most important strategic ally. This illustrates a broader point: economic interdependence does not prevent conflict. It simply ensures that when conflict arrives, the damage is global. The consequences fall not only on adversaries but on the neutral, the vulnerable, and the uninvolved. Disruptions to fertilizer, medicine, and industrial inputs are already being felt most acutely in countries across the Global South, which lack the financial reserves and infrastructure to absorb sustained supply shocks.


Three Paths Forward

The world now faces three plausible trajectories, each with significantly different consequences. The first is escalation and prolonged closure. If the conflict widens, or if Iran deploys naval mines, the closure could persist for months. This would likely tip the global economy into recession and accelerate a fragmentation of energy markets along geopolitical lines, as countries begin prioritising supply security over efficiency and cost.


The second is negotiated de-escalation. A ceasefire or back-channel agreement reopens the strait, shipping resumes, and markets stabilise. This is the most probable near-term outcome. It is also the least satisfying, because it resolves nothing. The underlying tensions remain entirely intact, and the world returns to the same fragile equilibrium it occupied before February 28.


The third path is structural change. The crisis creates the political conditions for something more durable: accelerated investment in alternative pipeline routes, expanded renewable energy capacity, and genuinely diversified supply chains. Under this scenario, the strait does not lose its centrality through diplomacy. It loses it through irrelevance, as the global energy system is gradually rebuilt around it.


The Lesson We Keep Refusing to Learn

Every prior crisis at the strait ended just soon enough for the world to avoid acting on it. The 1980s tanker war, the 2019 attacks on Gulf shipping, the repeated IRGC threats during nuclear negotiations: each episode produced alarm, analysis, and inaction. The equilibrium held, and the urgency faded.


The pattern suggests that the obstacle is not knowledge. The world has long understood the risk. The obstacle is political will. Reducing dependence on the strait requires difficult and expensive decisions: building new infrastructure, subsidising alternative energy sources, and accepting short-term costs for long-term resilience. Those decisions are easy to defer when the crisis passes quickly enough.


The strait is not primarily a problem of geography. It is a problem of strategic imagination. And if this crisis follows the pattern of every one that preceded it, the world will stabilise, breathe a collective sigh of relief, and defer those decisions once again.


The question is no longer whether the Strait of Hormuz can be closed. We now know that it can. The question is whether the world will finally treat that knowledge as the reason to act, rather than the reason to worry.


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