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Why Is the United States So Sensitive to “Mines” in the Strait of Hormuz? ⚓
From the Iran-Contra Scandal to the 1987 Mine War, and the Blockade Risks of 2026

A closure of the Strait of Hormuz is not simply about a few tankers being disrupted.

Mines, in particular, are one of the maritime threats markets fear most, because they are relatively easy to lay but can take a long time to remove.

As tensions surrounding the Strait of Hormuz have risen again recently, one term has drawn especially close attention from the market. That term is mines. Missiles and drones often strike once and the immediate event ends, but mines can remain in the sea and disrupt shipping for a long time afterward.

There is a reason the United States reacts so sensitively to this issue. During the Iran-Iraq War in the 1980s, actual mine warfare took place in the Strait of Hormuz and nearby sea lanes, and the United States experienced firsthand how limited yet highly nerve-racking a response could become. To understand the current situation, it helps to look back at that history first.

1. It Began with the Lebanon Hostage Crisis and the Iran-Contra Scandal 🎭

In the mid-1980s, a number of Americans were kidnapped in Lebanon by pro-Iranian militant groups. Among those held for long periods were CIA Beirut station chief William Buckley and Associated Press reporter Terry Anderson, and the United States attempted secret contacts with Iran in order to address the hostage issue.

In the process, the United States secretly arranged weapons transfers to Iran, and it was later revealed in 1986 that part of the proceeds had been diverted to support the Contra rebels in Nicaragua. That became known as the Iran-Contra scandal.

From the American perspective at the time, a direct full-scale confrontation with Iran was politically very difficult. Domestic politics were already being shaken by both the hostage issue and the scandal over secret arms dealings.

💡 Core Background

In the late 1980s, the United States was not simply in a position where it did not want to fight Iran. It was in a situation where for several reasons, it was difficult to fight a much larger war. That is why, even in the Strait of Hormuz, Washington chose a limited response rather than a full-scale one.

2. In 1987, Iran Really Did Shake the Strait of Hormuz with Mines 💣

In the later stage of the Iran-Iraq War, which lasted from 1980 to 1988, the so-called “Tanker War” escalated sharply. Iran used a strategy of threatening sea lanes in order to pressure Iraq’s oil exports and Western support in the Gulf.

The symbolic event came on July 24, 1987, when the Kuwaiti tanker Bridgeton struck an Iranian mine. During the first convoy operation involving a reflagged tanker under U.S. escort, a massive oil tanker was hit by an Iranian mine, shocking observers.

The incident showed that “even with the U.S. Navy present, mines are hard to stop,” and after that the United States devoted much greater resources to sea-lane protection and mine countermeasures.

3. Then Why Did the United States Focus on “Keeping Routes Open” Instead of Full-Scale War? 🚢

At the time, the United States did not want a larger war with Iran. The Cold War had not yet ended, and the Iran-Contra scandal was also politically burdensome. So rather than trying to take total control of the entire Strait of Hormuz, the United States responded by securing the minimum sea lanes necessary for tankers to pass.

Put simply, the goal was not to eliminate every risk, but to keep at least a usable shipping corridor open so that oil transport could continue. That was America’s realistic choice in 1987.

📘 Important Point

In mine warfare, what matters is not complete normalization, but first opening a safe route that ships can use as quickly as possible. That is why markets care more about “when the first passage can resume” than about “full mine clearance.”

4. Why Are Mines Such a Frightening Weapon? 🌊

Mines are an asymmetric weapon with an extremely large effect relative to their cost of deployment. They are not like ships or aircraft that move and fight directly. Their greatest danger lies in the fact that they remain in the sea and continue to pose a threat.

For shipping companies, the real fear is often not “exactly how many mines were laid,” but the uncertainty of “where there may still be more.” That is why even the confirmation of only a few mines can raise insurance costs and make shipowners and operators reluctant to enter a route.

In other words, mines do not need to be laid in large numbers to be effective. They are a weapon that can freeze an entire sea lane even if only a small number are deployed.

5. What Is the Difference Between Floating Mines, Moored Mines, and Bottom Mines? ⚙️

In the past, floating mines drifting on the surface or near the surface were widely known. But because floating mines can drift with currents and cause extensive civilian harm, their use is now heavily restricted.

In modern naval warfare, the more realistic threats are moored mines and bottom mines. Moored mines are attached to weights on the seabed by chains or cables and float at a fixed depth underwater, while bottom mines remain hidden on the seabed and activate when they detect the signals of passing ships.

Bottom mines, in particular, become very difficult to detect if they are partially buried in sand or mud. That means the sea may look calm on the surface, while in reality the entire route has become a dangerous zone.

🧠 Why Does Mine Clearance Take So Long?

Once mines are laid, they must be found one by one, identified, removed, and then the route must be checked again. That is why people say, “Mines are far harder to remove than they are to lay.”

6. Why Is the United States So Sensitive to the Mine Issue Again in 2026? 🔥

In March 2026, the United States and major media outlets reported in succession that signs had been detected suggesting Iran had deployed or was preparing to deploy mines in the Strait of Hormuz. CBS, citing U.S. officials, reported that Iran could use small boats capable of carrying two or three mines.

Reuters then reported on March 11 that Iran had laid roughly a dozen mines in the Strait of Hormuz. The United States said it had struck several Iranian minelaying vessels, and President Trump also issued public warning messages on the matter several times.

In other words, the current U.S. reaction is not just rhetorical posturing. It strongly reflects the idea that “mines have to be stopped before they begin to spread in larger numbers”. There is a huge difference in difficulty between intercepting a small initial deployment and trying to clear mines after they have already been dispersed widely.

7. But There Is Also a View That U.S. Mine-Clearing Capability Is Not What It Used to Be 🛠️

The U.S. Navy once operated dedicated minesweeper forces, but that structure has been significantly reduced in recent years. After the last remaining Avenger-class mine countermeasure ships were retired in Bahrain in September 2025, the system shifted toward one centered on littoral combat ships (LCS), helicopters, and unmanned surface vehicles.

The problem is that it is hard to say this has fully replaced traditional dedicated minesweepers. Mine warfare is an extremely specialized field, so having equipment alone does not automatically produce the same level of capability.

That is why some analysts argue that if mine warfare in a narrow and complex area like the Strait of Hormuz drags on, the burden on the United States could grow substantially.

8. One of the Cards the United States Counts On Is Japan’s Mine-Clearing Capability 🇯🇵

The Japan Maritime Self-Defense Force has long placed strong emphasis on mine warfare capabilities, and it is widely regarded as one of the top forces in the world in this field. Japan has consistently operated numerous minesweepers and mine-countermeasure helicopters, and has accumulated specialized experience in mine-removal missions.

Mine clearance is more defensive in character than offensive, which also overlaps to some extent with the mission profile of Japan’s Self-Defense Forces. That is why, if mine warfare in the Strait of Hormuz were to intensify, the possibility of the United States requesting Japanese cooperation is discussed regularly.

📘 The Key Point Here

The problem of a Strait of Hormuz blockade is not simply about military confrontation between the United States and Iran. It is also about who can actually remove the mines and reopen the sea lanes.

9. There Are Also Clear Differences Between the Past and the Present ⛽

The biggest difference between the 1980s and today is that the United States is no longer a country that depends absolutely on oil passing through the Strait of Hormuz in the way it once did. The United States is now also a major energy producer and exporter.

By contrast, the countries more sensitive to volumes passing through the Strait of Hormuz are Asian importers such as China, South Korea, Japan, and Taiwan. Oil matters, of course, but LNG is particularly important because it is difficult to stockpile for long periods, meaning the effects of any prolonged disruption in the strait could become real more quickly.

That is why the current Hormuz crisis is no longer only an American problem. It is increasingly connected to the broader energy security of East Asia.

10. Just Because One Ship Passed Through Does Not Mean the Route Is Safe ⚠️

The recent strike on the Thai bulk carrier MAYUREE NAREE while transiting the Strait of Hormuz sent an important signal to the market. A situation where “some ships get through and others get hit” is already, by definition, not a normal shipping environment.

In this kind of situation, even if not every vessel is completely blocked, the secondary shocks can be much larger: rising insurance premiums, route avoidance, loading delays, and vessel shortages. In other words, a blockade does not need to be 100% complete to deliver a major shock to the market.

In the end, the real question is not “did one ship get through?” but rather whether ships can continue passing with confidence and predictability. At the moment, the situation still appears far from that point.

11. So What Should the Market Be Watching Right Now? 📌

First, it matters less exactly how many mines Iran has already laid than whether additional deployment continues.
Second, even if the United States succeeds in striking minelaying vessels, mines that have already been dispersed still require separate clearance operations.
Third, a partial reopening of traffic and full normalization are completely different things.
Fourth, the direct economic shock may be more immediate for Asian importers such as South Korea, Japan, Taiwan, and China than for the United States.

So the market should not focus only on whether “the war gets bigger.” It also needs to watch the number of mines, mine-clearing capability, the timing of the first secure passage, and changes in shipping insurance and freight rates. The real danger may lie not in missiles, but in how long persistent mines can keep the strait effectively constrained.

📌 Today’s Economic Takeaway in One Line

The United States is sensitive to mines in the Strait of Hormuz because it has real historical experience with mine warfare there in 1987.
Mines are far harder to remove than to deploy, and there is a major difference between partially reopening a route and fully normalizing traffic.
In this crisis, the most direct economic impact may fall more heavily on Asian energy importers such as South Korea, Japan, Taiwan, and China than on the United States.

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Roots and Branches

Why Naval Mines in the Strait of Hormuz Still Frighten Global Energy Markets

Why Is the United States So Sensitive to “Mines” in the Strait of Hormuz? ⚓
From the Iran-Contra Scandal to the 1987 Mine War, and the Blockade Risks of 2026