Iran's IRGC Seizes Second US Military Underwater Drone in Strait of Hormuz

The shadow war in the Strait of Hormuz escalated on Sunday as Iran's Islamic Revolutionary Guard Corps (IRGC) announced the capture of a second U.S. military unmanned underwater vehicle in less than three weeks. The seizure of the Remus 600 autonomous drone underscores the intensifying electronic and naval confrontation in a waterway that historically handles 20 percent of the world's oil supply.[1][2][5]

In a statement broadcast on state television, the IRGC naval forces claimed the drone was operating for 'espionage purposes' and was trapped through a 'coordinated, complex operation involving intelligence oversight and electronic warfare.' The announcement marks a public assertion of Iranian technical capabilities in a highly contested maritime environment.[2]

Iranian military specialists are reportedly working to recover data from the captured vehicle. The Remus 600, a widely used autonomous underwater vehicle designed for mine countermeasures, hydrographic reconnaissance, and surveillance, represents a valuable intelligence prize if its systems remain intact.[5]

The incident follows the September 8 capture of another U.S. submarine drone near the entrance to the strait. In that earlier episode, the IRGC seized an Anduril Dive-LD autonomous vehicle, a 5.8-meter system delivered to the U.S. Navy's Unmanned Undersea Vehicle Group 1 in 2025.[4][5]

U.S. Central Command (CENTCOM) downplayed the significance of the September 8 loss, stating at the time that the Dive-LD had malfunctioned more than a day before its capture. U.S. officials described it as an older model that carried no classified sonar or radar equipment, framing the seizure as the recovery of a defective asset rather than a tactical defeat.

The consecutive drone seizures occur against the backdrop of a broader maritime standoff that has severely disrupted global trade. Iran has maintained an effective blockade of the Strait of Hormuz since the outbreak of the wider Middle East conflict in late February 2026.[5]

In response to the Iranian actions, the United States has imposed a counter-blockade on Iranian ports, creating a tense military deadlock. The IRGC Navy reiterated on Sunday that the strait 'is blocked' and warned it would continuously and decisively confront unauthorized transit through the strategic waterway.[2][5]

The deployment of unmanned underwater vehicles by the U.S. military is part of a broader effort to monitor the strait, map the seabed, and detect potential naval mines laid by Iranian forces. The loss of two such systems in rapid succession highlights the vulnerability of autonomous assets in heavily monitored littoral waters.

Diplomatic efforts to reopen the shipping lane remain deadlocked. Iranian officials recently conveyed a seven-day proposal through Qatari mediators to lift the blockade, contingent on the U.S. meeting specific conditions, including an end to hostilities.[5]

The Trump administration rejected the framework, refusing to yield to Tehran's demands. Following the diplomatic breakdown, the IRGC has vowed to maintain pressure on U.S. military assets in the region, signaling that the maritime confrontation will persist until a broader political resolution is reached.[5]