Iran says it has captured a U.S. autonomous underwater vehicle at the entrance to the Strait of Hormuz, an episode that places military competition beneath the waters of a passage critical to global energy supplies. The claim came as regional tensions intensified following Iranian action against U.S.-linked oil tankers and reports of missile attacks on U.S. destroyers.
The Islamic Revolutionary Guard Corps Navy said on Tuesday, 8 September 2026, that it had taken the uncrewed submarine during an operation at dawn. It described the vehicle as “a prize of war” secured through a complex intelligence and operational action. The U.S. military has yet to provide independent confirmation that Iran seized it.
Iranian state media identified the craft as a Dive-LD, a large autonomous underwater vehicle made by the California defence firm Anduril. The Pentagon said an underwater drone had “malfunctioned more than a day ago” while conducting surveys of regional waters in support of ongoing operations.
The Revolutionary Guards Navy presented the incident as a significant operational success. It said: “We trapped one of the most modern, intelligent and unmanned submarines of the terrorist American army at the entrance to the Strait of Hormuz. This submersible is equipped with the latest technologies.”
The Pentagon gave a sharply different account of the vehicle’s importance. A spokesperson said: “It was surveying regional waters in support of ongoing operations. The defective drone was an older model that neither collected sensitive data nor carried any classified sonar or radar equipment.”
The Dive-LD was first delivered to the U.S. Navy last year. It is a 19-foot (5.8-metre) submersible built to reach depths of as much as 6,000 metres (19,700 feet), with units costing about $2.5 million each.
According to Anduril’s website, the vehicle can operate for up to 10 days without returning to base. Its potential tasks include mine countermeasures, seabed mapping, intelligence gathering and inspections of underwater infrastructure, including cables and pipelines. Those capabilities help explain the competing accounts of its capture, although the precise intelligence value of the craft to Iranian forces remains unclear.
Questions also remain over its condition before Iranian forces recovered it, whether any sensitive software was aboard and whether Washington will seek its return. Iran has not said whether it intends to retain or return the vehicle.
The seizure follows other reported incidents involving U.S. interests in the Persian Gulf. The Revolutionary Guards said days earlier that they had targeted three U.S.-linked oil tankers there. Iranian state television also said the Guards had fired ballistic missiles at two U.S. destroyers. The U.S. military did not immediately comment on that report, and the specific ships and any damage were not identified.
The episode has precedents, though each arose in different circumstances. China seized a U.S. Navy ocean glider in the South China Sea in December 2016 before eventually returning it. Iran captured a Central Intelligence Agency RQ-170 Sentinel drone in 2011 and later said it had reverse-engineered elements of the aircraft’s design.
For now, Iran is portraying the Dive-LD recovery as proof of its ability to find and take a sophisticated U.S. system in a strategically sensitive waterway. The Pentagon says the drone had already failed and had no classified equipment. Whether the incident leads to a formal U.S. acknowledgement, an effort to recover the vehicle or further military action remains unknown.
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