Haegeom / Sea Sword family
A South Korean experimental USV family supporting surveillance and subsequent naval development programmes.
- Country / region
- South Korea
- Programme status
- Development / trials
- Sources reviewed
- 21 Sept 2026
- Primary domain
- Sea surface
- System type
- Uncrewed surface vessel
- Developer / manufacturer
- LIG Nex1
- Origin / production countries
- South Korea
- Other names
- Sea Sword; 해검
- Variants / configurations
- Haegeom-II; Haegeom-III; Haegeom-V; M-Hunter — related research branch; 2024 DAPA reconnaissance USV development
- Operators / programme customers
- South Korean defence development programme; fleet acceptance not established
Evidence & current status
Public programme evidence establishes the stated maturity only; unreported numerical data remain unknown.
Role & capabilities
- Maritime surveillance
- Modular mission equipment
Specifications in context
- Configuration
- Haegeom experimental USV family
Published configuration baseline; not independently demonstrated at every loading and sea condition.
Source - Hull / propulsion
- Not established in the reviewed public sources.
Public evidence gap. No estimate or neighbouring variant value has been substituted.
Source - Dimensions
- Contracted reconnaissance development: 12-metre class
Describes the two-vessel development requirement, not all Haegeom demonstrators.
Source - Displacement / mass
- Not established in the reviewed public sources.
Public evidence gap. No estimate or neighbouring variant value has been substituted.
Source - Payload
- Haegeom-II: remotely operated underwater inspection module
Published configuration baseline; not independently demonstrated at every loading and sea condition.
Source - Endurance
- Not established in the reviewed public sources.
Public evidence gap. No estimate or neighbouring variant value has been substituted.
Source - Range
- Not established in the reviewed public sources.
Public evidence gap. No estimate or neighbouring variant value has been substituted.
Source - Speed
- Not established in the reviewed public sources.
Public evidence gap. No estimate or neighbouring variant value has been substituted.
Source - Sea state / environment
- Haegeom-III: sea state 4 trials reported
Specific demonstrator trial claim; not a rating for every variant.
Source - Sensors
- Not established in the reviewed public sources.
Public evidence gap. No estimate or neighbouring variant value has been substituted.
Source - Communications / control
- Not established in the reviewed public sources.
Public evidence gap. No estimate or neighbouring variant value has been substituted.
Source - Launch / deployment
- Haegeom-V: supporting-ship deployment concept
Published configuration baseline; not independently demonstrated at every loading and sea condition.
Source