On June 17, the United States and Iran announced a deal aimed at reducing tensions. Two days later, shipping companies sent a blunt message: the deal alone won't bring their cargo ships back.

The Strait of Hormuz is a narrow waterway between Iran and Oman that roughly one-fifth of the world's seaborne oil flows through—think of it as the world's most important delivery route for energy. Earlier this year, the strait was mined (explosive devices placed underwater), forcing ships to take much longer and more expensive routes. The U.S.-Iran agreement on June 17 included commitments from both sides to negotiate a final deal within 60 days and to release about $24 billion in Iranian money that has been frozen in bank accounts worldwide.

But on June 19, industry groups that represent shipping companies said something crucial: ships will not return to normal traffic patterns until the mines are physically removed from the water.

That is a statement about physics and time, not politics. An agreement between two governments is not the same as a cleared waterway.

The Mine Problem

Shipping industry groups report approximately 80 mines currently in the strait. Earlier reports from March had suggested there were roughly a dozen. Either more mines have been placed, or initial surveys found only a fraction of what actually exists. For the purposes of clearing operations, 80 is the number that matters.

Mine-clearing work began in April 2026. The U.S. Navy started by sending two destroyer ships, then shifted to using drone systems—unmanned underwater vehicles that can search the seafloor and surface for mines without putting sailors at risk during the work. Reuters reported on June 15 that clearing all the mines could take weeks, even after a final peace agreement is signed.

Multiple countries are involved in the effort. The European Union proposed a naval mission in early June to take the lead on mine-clearing. Britain prepared to send specialized mine-hunting ships. The International Maritime Organization (the United Nations agency that oversees shipping) has called for all these navies to work together carefully to avoid ship collisions while they search for mines.

Here is the practical challenge: three different navies—American, European, and British—will be working in the same crowded, dangerous waters at the same time, searching for 80 mines in a waterway that is already tight and busy under normal circumstances. That coordination is difficult and risky.

Why This Matters for the World

The Strait of Hormuz is the most important shipping lane for oil and natural gas in the world. When it became too dangerous, ships rerouted around Africa or through pipeline systems—journeys that take much longer, cost much more money, and drive up the price of fuel and heating globally.

The June 19 shipping industry statement was clear on one point: an agreement between governments does not automatically mean normal operations will resume. Mine-clearance takes time. The deal gives Iran incentive to cooperate—the unfrozen money is worth billions—but 80 underwater explosives in one of the world's narrowest straits are a problem that cannot be solved by signing a document.

There is now a 60-day clock running on final negotiations. Meanwhile, mine-clearing operations continue at their own pace. Whether clearing finishes before or after diplomats reach a final agreement will determine how quickly energy prices and shipping costs return to normal—or whether the world lives with high costs for months longer.