Analysis | The US Navy’s Weak Spot: Mines in the Strait of Hormuz Expose a Critical Gap

The confrontation between the United States and Iran escalated sharply following Tehran’s actions to close the Strait of Hormuz to shipping, which included raising the possibility that shipping lanes had been mined. This move caught the U.S. Navy at a critical chokepoint and exposed an operational gap that could affect ongoing maritime operations in the region.

Naval mines, invented two hundred years ago, have been refined over the years into powerful defensive weapons. Alongside this evolution, mine detection and neutralization technologies have also advanced, eventually taking the form of wooden-hulled ships equipped with acoustic sensors and remotely operated underwater vehicles designed to safely detonate mines from a distance.

For decades, the US Navy relied on the Avenger-class minesweepers – wooden-hulled vessels designed to clear mines without triggering magnetic fuzes – to secure vital waterways such as the Persian Gulf. However, in late 2025 and early 2026, as part of a pre-planned drawdown, the US withdrew these aging assets from the Middle East, redirecting attention to the Pacific theater and distributed maritime operations, while transferring the last Avenger ships previously stationed in the Gulf to Malaysia.

Security analysts emphasized that the timing of this move was highly controversial. The US effectively retired or relocated its manned, dedicated minesweeping platforms just months before Iran mined the Strait of Hormuz. This created a dangerous window in which the old systems were gone, but the technologically advanced replacements were not yet fully operational or deployed at scale in the region.

The Shift to Unmanned Technology and Its Associated Challenges

The current U.S. Navy doctrine for mine countermeasures is based on the philosophy of “removing humans from the minefield.” Instead of risking crews of 80 on slow minesweepers, the Navy has transitioned to modular, unmanned systems deployed primarily from littoral combat ships (LCS) or other ad hoc vessels.

These systems include the Knifefish UUV, a torpedo-shaped unmanned underwater vehicle that uses advanced low-frequency synthetic aperture sonar to detect and classify buried mines and seabed-laid mines that traditional sonars may miss. Another system is the Unmanned Influence Sweep System (UISS), a remotely operated, semi-autonomous surface vessel that replicates the acoustic and magnetic signatures of large warships to safely trigger “smart” mines from a safe distance.

While these technologies represent a major leap in safety and detection capabilities, recent events have shown that large-scale deployment, integration into high-pressure combat environments, and maintenance without dedicated motherships remain a significant logistical challenge.

International Cooperation: Bridging the Operational Gap

When US unmanned minesweeping capabilities are stretched to the limit or unavailable in the area, international allies become critical to maintaining the flow of global commerce through the Strait of Hormuz. The Royal Navy, for example, redeployed the minesweeper it had stationed in the Persian Gulf for decades. 

To bridge the operational gap, the UK adopted a pragmatic rapid-deployment approach: It equipped the auxiliary ship RFA Lyme Bay with modular unmanned mine countermeasure systems and is considering using fully civilian transport vessels to bring mine countermeasure capabilities into the Gulf. 

Belgium, recognized globally for mine warfare expertise, has also expressed willingness to deploy its latest City-class minehunters, designed specifically to act as command hubs for a large array of unmanned assets. Japan, which maintains a trained and equipped minesweeper fleet, is also considering sending ships to the Gulf to assist.

The 2026 Strait of Hormuz crisis serves as a critical stress test for modern naval mine warfare doctrine. It has shown that while unmanned systems are undoubtedly the future – drastically reducing risks to human life – the transition phase left the U.S. temporarily dependent on allies to fill operational gaps. Successful clearance of the strait will ultimately rely not on a single ship or fleet but on coordinated cooperation among multiple navies and a variety of technologies and platforms.