Iran’s Islamic Revolutionary Guard Corps (IRGC) captured a U.S. Navy unmanned submarine near the Strait of Hormuz this week. The vessel, an Anduril Dive-LD autonomous underwater vehicle, reportedly malfunctioned before being seized, sparking concerns over the potential for Tehran to reverse-engineer Western underwater technology.
Anduril Dive-LD: Capabilities and “Attritability”
The captured vessel is a Dive-LD, an autonomous underwater vehicle produced by the California-based firm Anduril Industries. Designed for long-duration missions, the submersible is 19ft long by 4ft wide and weighs three tons. It is utilized for surveillance, seabed mapping, mine detection, and precision placement.
- Maximum Depth: 6,000 meters (19,700 feet)
- Endurance: Up to 10 days
- Estimated Cost: Nearly $2.5m
Anduril founder Palmer Luckey and company spokespeople have downplayed the loss, framing the Dive-LD as an attritable system. This means the vehicle is mass-produced and specifically designed to operate in hazardous environments where loss or capture is an expected possibility. Luckey noted that the specific vehicle had operated in support of American forces for thousands of hours within the CENTCOM area of responsibility before its capture.
Covert Mine Clearing in the Strait of Hormuz
The loss of the drone comes amid a secret U.S. Navy effort to clear Iranian mines from the Strait of Hormuz. According to reporting from the Financial Times, Navy SEALs have spent several months using specialized underwater drones and robot boats to locate explosives on the seabed, which divers then destroy during nighttime missions.
While Donald Trump claimed on Aug. 25 that the U.S. had cleared all mines, CENTCOM later clarified that the removal applied to internationally-recognised shipping lanes. Despite these efforts and a U.S. air defence umbrella provided to approximately 1,600 vessels, shipping traffic remains far below pre-war levels due to regular Iranian attacks on transiting ships.
Reverse Engineering and Technical Risks
The capture creates a tactical tension between the U.S. military’s public dismissal of the hardware and expert warnings. A Pentagon spokesperson described the drone as an older model that carried no classified sonar, radar, or sensitive data. However, experts suggest the physical hardware remains a prize.
Prof. Kevin Rowlands, a naval expert, noted that the Strait of Hormuz has become a “testing ground” for new technologies such as the Dive-LD. Rowlands argued that moving to uncrewed systems is specifically intended to reduce the political and diplomatic damage that occurs when human personnel are captured.
Tit-for-Tat Escalation in Regional Waters
The capture of the submarine coincided with a significant wave of maritime strikes; Tehran claimed to have attacked two US vessels and eight oil tankers, while the U.S. military stated on Tuesday evening that it destroyed five Iranian crude oil carriers. US Central Command says it hit these carriers after attempted Iranian missile attacks on a US Navy warship over the past two days.
Further claims regarding U.S. assets in the region emerged on September 27, 2026, when Iran’s IRIB released an official report stating that the IRGC Navy had captured a second advanced unmanned underwater vehicle, identified as a Remus 600 (U.S. military designation Mk 18 Mod 2 Kingfish). The IRGC claimed this second capture was achieved through a coordinated and complex operation utilizing intelligence, surveillance, and electronic warfare capabilities.