JFD Delivers Advanced Submarine Rescue System to Republic of Korea Navy

The Republic of Korea Navy (ROKN) has taken a significant step forward in submariner safety and rescue capability with the delivery of an advanced Submarine Rescue Vehicle (SRV) by JFD, a part of the Defence Division within James Fisher and Sons plc. This delivery marks a milestone achievement for the company, as it is the first time a free-swimming SRV has been deployed and recovered through a moonpool using an innovative Launch and Recovery System (LARS).

A New Era in Submarine Rescue Operations

The newly delivered system was developed in partnership with South Korean shipbuilder Hanwha Ocean as part of a major project to upgrade the ROKN’s submarine rescue capability. Unlike conventional SRV systems that are launched from the side or stern of a ship, this SRV is designed for deployment through a moonpool — a vertical opening in the center of a ship's hull — which provides safer and more stable operations, especially in rough sea conditions.

The integration process took place after successful Factory Acceptance Trials (FAT) and Harbour Acceptance Trials (HAT) at JFD’s subsea manufacturing facility in Glasgow, Scotland. The final phase involved integrating the SRV with the rescue vessel’s moonpool system, requiring specially engineered modifications for precise subsea operations.

Specifications of the Submarine Rescue Vehicle (SRV)

• Type: Free-swimming, crewed Submarine Rescue Vehicle

• Launch Method: Moonpool deployment using custom Launch and Recovery System (LARS)

• Capacity: Can rescue up to 17 submariners at a time

• Operating Depth: Capable of diving to depths of up to 500 meters

• Range: Over 25 nautical miles in a single operation

• Mating Capability: Designed to mate with distressed submarines (DISSUB) at various angles on the seabed

• Control System: Advanced subsea navigation and positioning system for precise manoeuvring

• Recovery: Hydraulic latching system for secure handling through the moonpool cradle

This SRV is designed to perform rapid response missions, delivering life-saving support to submariners trapped in distressed submarines deep beneath the ocean surface.

Why the Moonpool Design Matters

South Korea’s coastal waters are known for their unpredictable and often challenging sea conditions. The moonpool deployment method significantly reduces operational risks by allowing the SRV to be safely launched and recovered within the ship’s hull, protecting the equipment and crew from rough waves and adverse weather.

This approach ensures that rescue operations can continue safely and efficiently, even when sea states would prevent traditional launch methods.

Strengthening International Partnerships

JFD’s Managing Director of Defence, Rob Hales, highlighted the importance of the collaboration with Hanwha Ocean and the ROKN, stating:

“We are proud to strengthen our partnership with Hanwha Ocean and our long-standing support to the Republic of Korea Navy with this new submarine rescue capability. This collaboration has drawn on world-class expertise to deliver an innovative solution that enhances submariner safety and operational readiness.”

This achievement builds on the legacy of earlier-generation SRVs supplied by JFD to the Republic of Korea Navy, many of which remain in active service. The new system represents a leap forward in safety, technology, and operational flexibility.

The successful delivery and integration of this next-generation Submarine Rescue Vehicle marks a major advancement for the Republic of Korea Navy’s submarine force. It also showcases the strength of international cooperation in enhancing naval safety capabilities.

By combining innovation with operational reliability, this project ensures that the Republic of Korea Navy remains prepared for any underwater emergency, safeguarding the lives of its submariners in even the most challenging environments.