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Korea USV and UUV Programs

Test7

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South Korean defence contractor LIG Nex1 unveiled the latest iteration of its unmanned surface vehicle (USV) family, Hae Gum 3 (Sea Sword 3), at the Defense and Security Expo Korea (DX Korea) 2020 exhibition in Seoul in mid-November.

Sea Sword 3 is being developed under a civilian-military technology co-operation project led by the Agency for Defense Development (ADD) Institute of Civil-Military Technology Cooperation (ICMTC).

The USV has been optimised for coastal operations and can be used to perform various types of missions with the appropriate mission equipment, including a surveillance and reconnaissance suite. It will also incorporate artificial intelligence (AI)-driven autonomous navigation/obstacle avoidance technology.

The displacement and physical characteristics of the Sea Sword 3 USV are understood to be comparable with that of the Sea Sword 2. Janes earlier reported that the latter – which features a displacement of 11 tonnes – has an overall length of 12 m and a 3.5 m beam. However, Sea Sword 3 can optionally carry up to eight personnel, while Sea Sword 2 can only accommodate up to two personnel.

In terms of armament, Sea Sword 3 is equipped with a remote-controlled weapon station (RCWS) armed with a 12.7 mm heavy machine gun and a 2.75 inch calibre guided rocket launcher towards the stern, unlike the preceding Sea Sword 1 and 2 designs.

LIG Nex1 representatives told Janes that the Republic of Korea Army (RoKA) operates several types of patrol boats for coastal security and reconnaissance missions, and is positioning the Sea Sword 3 to replace these.

 

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South Korea’s Defense Acquisition Program Administration (DAPA) announced on 9 December that it will commence indigenous development of an autonomous underwater vehicle (AUV) optimised for mine detection.

DAPA said it awarded a KRW12 billion (USD 11 million) contract with local defence prime LIG Nex1 to develop highly autonomous underwater robots that can perform precise navigation and collision avoidance to boost the Republic of Korea Navy’s (RoKN’s) mine countermeasure (MCM) capabilities.

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A computer rending of DAPA’s mine detection AUV development. (DAPA)

The RoKN presently maintains a fleet of Swallow- and Yang Yang-class MCM vessels (MCMVs) to detect and defeat sea mines, according to Janes Fighting Ships.

The agency said the new mine detection AUV will be developed by 2023 and is expected to enable the RoKN to conduct MCM operations without risking its personnel.

DAPA said the AUV will also be able to monitor underwater infiltration, support rescue operations in marine accidents, or collect topographical information on the seabed.

It is understood that initial studies and development of the AUV was performed by Hanwha Systems, although further work will now be undertaken by LIG Nex1.

RoKN officials told Janes that the AUV will be deployed by the service’s future Mine Sweeper Hunter-2 (MSH-2) MCMVs to be built from 2024.

Besides LIG Nex1, Hanwha Systems is also developing a new unmanned underwater vehicle (UUV) that aimed at anti-submarine warfare (ASW) operations.

The unmanned platform, named ASWUUV, was revealed at the MADEX 2019 exhibition in Busan.

The ASWUUV has been under development by DAPA since 2017. Janes earlier reported that trials are scheduled in 2021, with development expected to be completed by 2022.
 

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South Korea's Defense Development Agency has released footage of ten unmanned boats heading out to sea in a group. The models of the sea drones are not disclosed, but the video shows the drones interacting synchronously.

 

urban mine

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On May 27, LIG Nex1 held the 'AI-based Unmanned Surface Vehicle (USV) Intelligent Command and Control Demonstration' at Korea Maritime & Ocean University, showcasing its AI-driven multipurpose unmanned system technologies that realize 'speed' and 'integration'—the core competitive edges of the future battlefield.

At the demonstration, which was attended by military officials, the Coast Guard, academia, and defense industry representatives, LIG Nex1 successfully executed a 'heterogeneous unmanned swarm connectivity' operation, marking South Korea's first-ever integration and control of different types of unmanned systems under a single unified system

The core of this project is the establishment of a 'hybrid simulation' environment that links actual maritime assets with high-fidelity simulators in real time via satellite communications. In the waters near Korea Maritime & Ocean University, a total of four physical vessels were deployed: LIG Nex1's flagship unmanned surface vehicles, Haegeom-3 and Haegeom-5, alongside two units of 'Haegeom-S'—a 3D-printed small multipurpose USV. The maritime maneuvers of the Haegeom-S were disclosed to the public for the first time at this event. Within the virtual simulator environment, these USVs meticulously recreated multi-domain assets mimicking a realistic battlefield, including enemy threats, manned destroyers, torpedoes, sonobuoys, and kamikaze (suicide) drones.

The demonstration on this day was conducted under two scenarios: anti-surface warfare (ASuW) and anti-submarine warfare (ASW). First, in the anti-surface warfare scenario, assuming a situation where an enemy surface vessel breached the Northern Limit Line (NLL), the system flawlessly executed a five-stage operation ranging from operational planning and warning shots to disabling fire and a kinetic impact attack (by the Haegeom-S). Furthermore, in the anti-submarine warfare scenario, the system demonstrated a real-time, seven-stage AI-based command and control process upon an enemy submarine infiltration—spanning from sonobuoy deployment and search operations via Towed Array Sonar Systems (TASS) to the launching of Blue Shark torpedoes and verification of the simulated kill.
 

urban mine

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Agency for Defense Development Unveils UUV ‘MR-X’
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MR-X is a technology demonstrator model for an uncrewed underwater vehicle (UUV) that was originally referred to as the Mission-Reconfigurable Extra-Large Uncrewed Underwater Vehicle (MRXUUV), with development beginning in October 2022. Led by the Agency for Defense Development (ADD), Hanwha Ocean, Hanwha Systems, and LIG D&A participated in its production. It serves as a follow-on project to the Anti-Submarine Warfare Uncrewed Underwater Vehicle (ASWUUV), which successfully achieved its first autonomous navigation in 2022.

The defining characteristic of the MR-X lies in its size. It features a hull significantly larger than the torpedo-sized small UUVs previously produced by research institutes and corporations. Measuring approximately 20 meters in length, 3 meters in diameter, and displacing around 50 tons, it is comparable to the United States' Orca Extra-Large Uncrewed Underwater Vehicle (Orca XLUUV), which reaches a maximum length of 26 meters. Leveraging this large hull, the MR-X offers greatly enhanced capabilities and mission scalability compared to conventional UUVs—which are smaller than manned submarines and limited to specialized tasks such as mine countermeasure operations.

The core capability of the MR-X is reconnaissance. First, it is equipped with a compact long-range detection periscope capable of day and night surveillance. This allows it to infiltrate enemy territory and detect adversary vessels. Thanks to AI-based intelligence, surveillance, and reconnaissance (ISR) capabilities, it can automatically recognize targets and scan its entire surroundings very rapidly, thereby reducing the exposure time of the periscope.

Another key feature of the MR-X is its underwater reconnaissance capability using a large sonar system. The vehicle features an active sonar on its bow and passive sonars on both flanks. Using these systems, the MR-X can infiltrate high-risk enemy waters to autonomously detect high-value underwater targets, such as North Korean nuclear-powered ballistic missile submarines (SSBNs). Upon detecting an enemy submarine, the MR-X surfaces to transmit the location data to intelligence ships or ground headquarters via satellite communication, UHF radio, or LTE. By penetrating territorial waters that the adversary considers secure, it makes hiding much more difficult for enemy submarines.

The most critical function of the MR-X is its ability to equip armaments within its multi-purpose module. The forward section of the hull can accommodate additional batteries or mission equipment depending on the scenario; by loading naval mines here, it can covertly infiltrate enemy harbors, lay mines, and escape. During the recent conflict in Iran, the Iranian Navy deployed manned boats and submarines under the threat of U.S. airstrikes to lay mines. The MR-X, by contrast, enables naval blockade operations without risking human lives, offering a significant tactical advantage to the Republic of Korea Navy.

To execute these missions, the MR-X employs a multi-component propulsion system. Auxiliary thrusters allow ultra-precise low-speed maneuvering to deploy mines at exact coordinates. Power for the five-bladed propulsion propeller is supplied by hydrogen fuel cells and lithium-ion batteries—the same technology applied to the KSS-III (Dosan Ahn Changho-class) submarines. Operating on this power system, the MR-X can conduct continuous operations for approximately 45 days, enabling extended covert missions. Research and development for the MR-X is scheduled to continue through September 2027, and ADD has publicly showcased video footage of the vehicle navigating underwater at the Defense Science and Technology Fair.

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The model formerly known as MRXUUV.

Prior to that, there was a model called ASWUUV that had been under development since 2017, but it appears to have only reconnaissance and tracking capabilities.
 
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