US intelligence officials have assessed that Iranian forces have deployed a small number of mines in the Strait of Hormuz, a critical chokepoint for global shipping. The move gives Iran an additional means, along with missiles and drones, to threaten vessels. The US Navy recently decommissioned its minesweeping vessels operating in the Persian Gulf, but retains other ships and aircraft for mine detection and destruction.
Modern sea mines have evolved far beyond the floating spheres depicted in films. According to computer scientists researching mine detection, contemporary mines often combine multiple sensing modes, such as magnetic, acoustic and pressure sensors. Some are designed to ignore smaller vessels and detonate only after a certain number of ships have passed, targeting higher-value vessels. Examples include the Iranian Maham 3, which uses both magnetic and acoustic sensors.
Many modern mines sit on the seabed, making them effective in shallow waters where ships pass close to the bottom. These mines can be deployed by small vessels or aircraft and are triggered when they sense a ship overhead. Some advanced designs, known as rising mines, launch upward toward a target once detected. The key advantage of naval mines lies not just in the damage they cause, but also in the time and resources required to find and clear them over large areas.
The mere possibility of mines can disrupt shipping and force costly clearance operations, as demonstrated during the Tanker War of the 1980s when Iran and Iraq deployed relatively small numbers of mines. Detection typically involves a wide-area sonar search, with automatic target recognition algorithms classifying contacts as minelike or benign. The British Royal Navy is reportedly preparing to send a towed sonar array to the Persian Gulf region to assist with these efforts.
