Iran's mine threats in Strait of Hormuz threaten global shipping

Tensions in the Persian Gulf have intensified as ships traveling near the Strait of Hormuz have come under fire or threat for the second straight month. Since late last month, at least 15 vessels have been attacked in or near the Hormuz corridor, including the Thai-flagged Mayuri Nari and the Japanese-flagged ONE Majesty on the 11th local time. Another two ships were struck in Iraqi waters, with authorities describing the incidents as involving unidentified projectiles or unmanned surface drones.

The attacks have disrupted maritime traffic through a critical chokepoint. Iran has begun raising the stakes with sea mines in the Persian Gulf, complicating navigation through the strait. The Hormuz Strait itself is only about 33 kilometers wide, with the navigable channel roughly 6 kilometers wide, meaning even a relatively small number of mines could deter or halt large commercial vessels.

Iran’s mine threat comes in several forms. Floating contact mines of the Sadaf family detonate on contact with a hull. More dangerous are the Maham-type mines that rest on the seabed and detect ships by engine noise or magnetic signatures, capable of sinking large ships. Also reported are underwater, rocket-propelled mines that can be launched toward a target. Iran is believed to possess more than 5,000 mines in total.

Removing these devices is a painstaking process. Mine-clearing ships, or minesweepers, use nonferrous materials to avoid magnetic detection and rely on sonar and drones to locate and neutralize ordnance. Work can take months, and even after clearance, the area can be quickly re-mined, complicating efforts to guarantee safe passage for commercial shipping.

Foreign reporting and local authorities say Iran has recently deployed dozens of mines around Hormuz using small boats, adding to the challenge for neutral shipping lanes. Despite surface countermeasures, the persistence of attacks indicates the broader difficulty in ensuring uninterrupted transit through this artery of global trade.

For U.S. readers, the episode underscores how fragile energy supply routes remain and how security commitments in the Persian Gulf influence national interests. The Strait of Hormuz funnels a large share of regional oil and other energy shipments to global markets, so disruptions can ripple through oil prices, shipping insurance, and supply chains worldwide. The episode also highlights ongoing strategic frictions between Iran and Western powers, and the continued role of U.S. and allied naval patrols in maintaining freedom of navigation in a volatile region.