HD Hyundai and Hanwha Ocean split naval platforms for export

HD Hyundai Heavy Industries and Hanwha Ocean advanced distinct naval platform export campaigns on Sept. 20, 2026, realigning shipyard capacity between surface combatants and diesel-electric submarines.

The strategic divergence reshapes an export framework brokered by South Korea's Defense Acquisition Program Administration in February 2025. That memorandum sought to prevent duplicate spending by assigning surface combatants to HD Hyundai and submarines to Hanwha Ocean.

Hanwha Ocean altered that balance on July 31, 2026 by signing a 7.8 trillion won ($5.65 billion) contract for the Korea Next-Generation Destroyer. The agreement awards detailed design and lead ship fabrication for six planned 7,000-ton Aegis destroyers.

The destroyer program represents the largest domestic surface combatant order awarded this decade. Hanwha Ocean previously built 13 of the 20 operational submarines in the Republic of Korea Navy, alongside 23 cumulative submarine contracts across four decades.

The yard also won depot maintenance work for the Aegis destroyer Sejong the Great in August 2026. That contract made Hanwha Ocean the first private shipbuilder entrusted with full-cycle maintenance on the navy's primary air-defense surface combatant.

HD Hyundai Heavy Industries built 102 domestic surface combatants, the highest manufacturing volume in South Korea. The Ulsan-based shipbuilder delivered guided-missile destroyers, frigates and patrol craft to domestic and foreign fleets since starting defense construction in 1976.

HD Hyundai is actively building an independent submarine business to offset Hanwha Ocean's surface warship gains. The shipbuilder signed a development agreement with Peru's state-owned SIMA shipyard on June 24, 2025 to develop the HDS-1500 submarine platform.

The Peruvian submarine program pairs basic engineering from Ulsan with local assembly at SIMA's Callao yard. The 1,500-ton diesel-electric vessel secured basic design approval from classification society DNV, featuring lithium-ion battery arrays instead of cryogenic air-independent propulsion.

The design accommodates deep-water operations in the Peru-Chile Trench, where operational depths exceed 3,000 meters. Peru seeks to replace six aging German-built Type 209 submarines, with each new boat estimated at roughly 650 billion won ($470 million).

HD Hyundai completed the basic design phase for the Peruvian submarine program in mid-July 2026. The shipbuilder held technical briefings at Callao with Peruvian naval commanders and trading partner Posco International to finalize equipment integration schedules.

Competition between the two shipbuilders also disrupted bilateral cooperation in Southeast Asian tenders. Both shipbuilders submitted independent bids in April 2026 for Thailand's 4,000-ton frigate procurement, a project valued at approximately 800 billion won ($580 million).

Hanwha Ocean secured preferred bidder status for the Thai frigate project on Sept. 9, 2026, beating European rivals. The selection marked Hanwha Ocean's first major surface export victory following its acquisition of Daewoo Shipbuilding and Marine Engineering in 2023.

The two shipbuilders are also contesting the Philippines' military modernization program, an initiative budgeted at $35 billion over 10 years. The Philippine Navy is reviewing proposals for two diesel-electric attack submarines to establish an initial underwater patrol capability.

HD Hyundai has delivered 12 naval vessels to Manila and discussed submarine options with Philippine Defense Secretary Gilberto Teodoro on Sept. 8, 2026. Hanwha Ocean submitted an offer based on its 3,000-ton Dosan Ahn Changho-class design.

The rivalry illustrates the structural limits of government-guided industrial specialization in high-value naval defense exports. Shipbuilders require balanced yard utilization across surface berths and submarine facilities to absorb uneven naval order cadences, analysts said.

The operational shift impacts domestic naval subsystems contractors supplying sensor arrays and weapons suites. Hanwha Systems integrates electronic sensor suites across Hanwha Ocean hulls, while LIG Nex1 supplies torpedoes and missile launchers to both shipbuilders under separate ministry procurement contracts.

The Defense Acquisition Program Administration has not published any formal revision to the February 2025 export pact, and neither shipbuilder has filed regulatory disclosures establishing an exclusive platform boundary.

Hanwha Ocean is scheduled to deliver the 7,000-ton lead KDDX destroyer to the navy in 2032. HD Hyundai Heavy Industries aims to conclude detailed design and construction terms for Peru's submarine program before the end of 2026.