Iran’s Navy Claims Second U.S. Underwater Drone Capture in Hormuz Strait

Iran’s Islamic Revolutionary Guard Corps Navy claimed on September 27 that it had captured a second U.S. Navy underwater drone operating in the Strait of Hormuz, according to statements released by IRGC-affiliated channels.^[1][2][3]

The IRGC identified the seized vehicle as a Remus 600, an autonomous underwater vehicle (AUV) used for intelligence gathering and oceanographic survey.^[1][2] According to the IRGC’s account, the capture occurred through “a coordinated and complex operation with intelligence oversight and electronic warfare capabilities,” language that suggests either active interdiction or recovery of a disabled unit.^[1]

The timing reflects broader Iranian military posturing in the Strait of Hormuz, a 21-mile-wide chokepoint through which roughly one-third of global maritime petroleum trade transits annually. The IRGC Navy statement declared the waterway “closed” and warned of “dangerous movements and unauthorized transits,” signaling intent to enforce Iranian claims over the strategic passage.^[1][2]

This announcement follows reported IRGC activity across multiple domains in the region. On September 27, accounts indicated the IRGC Navy had launched anti-ship cruise missiles and deployed fast-attack boats in the Strait.^[4] Separately, the IRGC’s Aerospace and Military Intelligence Directorate warned that if conflict resumed, it would target American ships in the Indian Ocean and beyond.^[5] On September 21, the IRGC reported downing a U.S.-made MQ-1 drone over the Strait.^[3]

The pattern reflects Iran’s strategy of demonstrating control over the Hormuz Strait through both hardware seizures and rhetorical escalation. The Remus 600 is a commercially available AUV manufactured by Hydroid, a subsidiary of Kongsberg Maritime, typically employed for seabed mapping and mine detection. Its capture – if verified – would provide Iranian technical specialists access to its sensor packages and data storage systems, potentially revealing U.S. intelligence collection priorities in the waterway.

Iranian officials have framed such operations as defensive assertions of sovereignty. The IRGC statement cited Quranic verse to contextualize the seizure as part of broader divine will, a rhetorical pattern consistent with how the organization frames military operations to domestic audiences.^[1][2]

Western confirmation of the capture has not yet emerged. The U.S. Navy has not publicly acknowledged loss of the vehicle. Verification of Iranian claims about drone seizures has historically been complicated – the IRGC has announced captures of U.S. surveillance assets before, though some claims have lacked independent corroboration.^[6]

The announcement occurs amid heightened regional tensions. On September 26, the IRGC Navy issued a statement indicating that “enemy warships will not be safe in the Indian Ocean during a new conflict,” signaling an expansion of Iran’s stated deterrence posture beyond the Persian Gulf.^[5] These statements, coupled with reports of increased anti-ship activity, suggest the IRGC is attempting to establish a credible threat to commercial and military shipping in one of the world’s most economically critical maritime corridors.

The Strait of Hormuz remains the focal point of U.S.-Iran strategic competition. American naval presence in the waterway is sustained partly through Fifth Fleet operations based in Bahrain and through carrier strike group rotations. Iran’s repeated claims of interdicting U.S. surveillance assets serve dual purposes: demonstrating deterrent capability to domestic constituencies and signaling to regional actors – particularly Gulf states dependent on Hormuz transit – that Iran can disrupt maritime traffic if provoked.