South Korea deploys KSS-III submarine on 14,000 km mission as Canada's $40 Billion deal enters final phase.

South Korea’s KSS-III class submarine ROKS Dosan Ahn Chang-ho departed Jinhae Naval Base on March 25, 2026, for a 14,000 km trans-Pacific deployment to Canada, demonstrating long-range blue-water capability as part of Ottawa’s $40 billion submarine replacement program.

The deployment includes bilateral anti-submarine warfare drills off Canada’s west coast from May 23 to June 2 involving Royal Canadian Navy and Royal Canadian Air Force assets, with arrival in Victoria marking entry into the final phase of Canada’s submarine competition. This evaluation sequence directly supports procurement decisions by testing interoperability, endurance, and combat integration, reinforcing strategic readiness and deterrence across Canada’s three-ocean operational environment.

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The voyage, spanning 14,000 km from Jinhae to Victoria, is synchronized with the final phase of Canada’s decision to acquire up to 12 submarines, placing this deployment at the intersection of naval capability assessment and strategic industrial positioning. (Picture source: South Korean Navy)

On March 25, 2026, the South Korean KSS-III submarine ROKS Dosan Ahn Chang-ho departed from Jinhae Naval Base toward Canada for a 14,000 km trans-Pacific mission directly tied to Ottawa’s submarine replacement program, which targets the acquisition of up to 12 diesel-electric submarines with an estimated value of $40 billion. The deployment is scheduled to conclude with arrival in Victoria, British Columbia, in late May, followed immediately by bilateral naval exercises running from May 23 to June 2. This will place the deployment within the final evaluation phase of Canada’s competition between the South Korean KSS-III design and Germany’s Type 212CD.

The mission combines a long-distance operational transit, joint exercises, and multinational participation, creating a continuous demonstration sequence lasting more than two months. The submarine is accompanied by a South Korean frigate, indicating a coordinated naval presence as Canada accelerates defense spending and advances procurement decisions tied to a multi-decade acquisition program with key operational, financial, and industrial implications. The exercise in which the KSS-III submarine will participate, off Canada’s west coast, will involve anti-submarine warfare scenarios integrating Royal Canadian Navy surface units and Royal Canadian Air Force maritime patrol aircraft, with a focus on detection, tracking, and engagement of submerged targets.

The drills are scheduled from May 23 to June 2 and will take place in the vicinity of Esquimalt, the primary base for Canada’s Pacific fleet. Two Royal Canadian Navy submariners are set to embark during the South Korean submarine transit phase in Hawaii and remain onboard through the final leg to Canada, allowing direct exposure to onboard systems, procedures, and crew operations. The embarkation is part of the REGULUS exchange framework, which focuses on cross-training in operational environments and tactics. Following the bilateral exercises, the Dosan Ahn Chang-ho submarine will redeploy to Hawaii to participate in the Rim of the Pacific (RIMPAC) exercise in late June, extending its operational cycle into a multinational setting involving multiple allied navies.

This sequence creates a layered evaluation environment, from bilateral integration to coalition-level operations, providing opportunities to assess interoperability, command integration, and operational tempo over an extended period. The transit itself covers approximately 14,000 km from Jinhae to Victoria, making it the longest recorded voyage by a South Korean submarine and the first full crossing of the Pacific by a KSS-III unit. The route includes planned logistics stops in Guam and Hawaii for resupply of fuel, provisions, and maintenance checks, ensuring sustained operational readiness throughout the journey. The Hawaii stop also serves as the embarkation point for Canadian personnel, integrating them into the crew for the final operational phase.

The transit duration spans several weeks, requiring continuous submerged and surfaced operations, crew rotation management, and system reliability over extended periods. South Korean submarines have previously operated as far as Hawaii, but this mission extends the country's operational reach across the entire Pacific basin. The deployment is structured to demonstrate sustained blue-water capability, including navigation, endurance, and logistical planning at an intercontinental scale. The voyage, therefore, functions as an operational stress test under real maritime conditions, while also providing Canadian observers with direct exposure to long-duration deployment patterns. 

The KSS-III class submarine is a domestically developed design produced by Hanwha Ocean, with a displacement estimated between 3,600 tons surfaced and over 4,000 tons submerged, and a length of roughly 89 meters. The propulsion system combines diesel engines, lithium-ion batteries, and an air-independent propulsion system, enabling submerged endurance exceeding three weeks without surfacing. These submarines, such as the Dosan Ahn Chang-ho, possess a maximum operational range of more than 7,000 nautical miles, allowing deployment across oceanic distances without reliance on forward basing. The submarine is equipped with six 533 mm torpedo tubes and a vertical launch system capable of deploying multiple missile types, depending on configuration.

The integration of lithium-ion batteries increases energy density compared to traditional lead-acid systems, supporting longer submerged operations and higher sustained speeds underwater. Representing a transition in South Korean naval construction toward larger, ocean-going submarines with extended mission profiles, their deployment to Canada provides a unique opportunity to observe performance parameters under extended operational conditions. Operational roles for the submarine include anti-submarine warfare, intelligence collection, surveillance, and strike missions, supported by onboard sonar systems and combat management architecture designed for multi-domain integration.

The vertical launch system provides capacity for land-attack or anti-ship missile deployment, expanding mission scope beyond traditional torpedo-based engagements. The submarine’s endurance profile supports missions lasting up to 60 days, with submerged operations exceeding three weeks depending on mission parameters and resupply intervals. The design allows operation across the Pacific, Atlantic, and Arctic, reflecting requirements for diverse environmental conditions, including cold-water and under-ice scenarios. Interoperability features include compatibility with allied communication systems and operational procedures, enabling integration into NATO-aligned operations. The current deployment allows these capabilities to be exercised in coordination with Canadian and multinational forces. 

Canada’s submarine procurement program aims to replace its four Victoria-class submarines, which were acquired secondhand in the late 1990s and are expected to retire in the mid-2030s. The program, known as the Canadian Patrol Submarine Project (CPSP), targets up to 12 new submarines capable of operating across Canada’s three ocean approaches, with emphasis on endurance, stealth, and long-range patrol capability. The competition has been narrowed to two competitors, the South Korean KSS-III and the German Type 212CD, both of which meet the operational requirements defined by the Royal Canadian Navy. The acquisition is expected to include not only construction but also infrastructure, training, and lifecycle sustainment, increasing total program costs significantly beyond initial procurement.

Delivery timelines proposed by bidders indicate the first submarine entering service by 2032, with subsequent units delivered annually to complete the fleet by the early 2040s. The procurement process is being conducted under an accelerated timeline compared to previous Canadian defense acquisitions, as the decision is expected around June 2026, with final proposals already submitted. Operational requirements for the future CPSP fleet are shaped by Canada’s geographic scope, which includes responsibility for the Arctic, Atlantic, and Pacific, requiring submarines capable of sustained operations in remote and harsh environments. The Arctic requirement also includes under-ice navigation, operation in extreme cold, and sustained patrols in areas with limited infrastructure and support.

Submarines must be capable of missions lasting up to 60 days, with submerged endurance exceeding 21 days, and operational ranges exceeding 7,000 nautical miles across vast maritime areas. Limited infrastructure in northern regions places emphasis on onboard autonomy, reliability, and maintenance resilience. Sensor and navigation systems must function effectively in environments with reduced satellite coverage and complex acoustic conditions. The KSS-III deployment indirectly addresses these factors through its long-range transit and sustained operations. Industrial considerations are another central factor in Canada’s submarine procurement decision, with both South Korean and German bidders proposing partnerships with Canadian industry across manufacturing, maintenance, and supply chains.

The South Korean proposal includes commitments to technology transfer, local production, and workforce development, alongside agreements with Canadian companies in sectors such as steel, aerospace, and advanced systems. Delivery schedules indicate that four submarines could be delivered by 2035 if a contract is signed in 2026, with full fleet completion by 2043. Early replacement of the Victoria-class fleet could generate maintenance savings estimated at up to $1B by avoiding extended operation of aging submarines. The program is expected to generate long-term economic activity and employment across multiple sectors in Canada. Industrial participation requirements have influenced both bidders to establish local partnerships prior to contract award. These factors are expected to weigh alongside operational performance in the final selection.

Written by Jérôme Brahy

Jérôme Brahy is a defense analyst and documentalist at Army Recognition. He specializes in naval modernization, aviation, drones, armored vehicles, and artillery, with a focus on strategic developments in the United States, China, Ukraine, Russia, Türkiye, and Belgium. His analyses go beyond the facts, providing context, identifying key actors, and explaining why defense news matters on a global scale.