Indonesia Crosses Strategic Threshold in Submarine Sovereignty as PT PAL Clears Scorpène Evolved Steel Cutting Qualification

(DEFENCE SECURITY ASIA) — The successful completion of the Steel Cutting Qualification Section for the Scorpène Evolved submarine on December 12, 2025, represents a decisive inflection point in Indonesia’s maritime defence trajectory, marking the moment when the country transitioned from licensed assembly and maintenance of submarines into the highly exclusive domain of validated submarine hull manufacturing under European military shipbuilding standards.

Conducted at PT PAL Indonesia’s sprawling Surabaya shipyard in East Java, the ceremony symbolised far more than the commencement of industrial activity, as it constituted formal recognition that Indonesia’s state-owned shipbuilder has met the stringent metallurgical, dimensional tolerance, welding integrity, and quality assurance benchmarks required for pressure-resistant submarine construction.

Within the context of escalating Indo-Pacific naval competition, where undersea dominance increasingly defines deterrence credibility, this milestone positions Indonesia as a rising submarine-capable industrial power rather than a passive consumer of foreign naval platforms.

The Steel Cutting Qualification Section represents the most technically sensitive threshold in any submarine localisation programme, as failure at this stage would invalidate downstream hull fabrication, acoustic performance, and survivability standards under deep-water operational stress.

This qualification process required Indonesian engineers to demonstrate mastery over high-yield steel plate cutting, precision alignment, and deformation control, ensuring that hull sections can withstand extreme hydrostatic pressure while maintaining low acoustic signatures critical for stealth operations.

By passing this qualification under Naval Group supervision, PT PAL has effectively proven its ability to reproduce European-grade submarine structural modules without reliance on overseas fabrication, a capability possessed by fewer than a dozen nations globally.

From a strategic standpoint, the qualification marks Indonesia’s shift from platform acquisition to capability absorption, reflecting Jakarta’s long-term intent to achieve sovereign control over one of the most complex weapon systems in modern warfare.

As PT PAL Indonesia Technology Director Briljan Gazalba stated during the ceremony, “The qualification section is a key part of the technology transfer process that supports Indonesia’s long-term goal of eventually designing, building, and maintaining submarines independently through cooperation with Naval Group. The programme will also support the country’s larger ambition to become more self-sufficient in underwater technology and defence.”

That statement underscores a doctrinal transformation within Indonesia’s defence planning, where submarine capability is no longer viewed solely as an operational asset but as a national strategic industry.

Naval Group Programme Director Vincent Vimont reinforced this strategic framing by noting, “The steel cutting qualification demonstrates the company’s support for full local production of the Scorpène submarine.”

The presence of senior Indonesian Navy officers and French diplomatic representatives further elevated the event beyond an industrial ceremony, transforming it into a visible manifestation of Indo-French strategic alignment within the contested maritime geometry of the Indo-Pacific.

From Memoranda to Metal: The Evolution of the Indo-French Submarine Partnership

The steel cutting milestone represents the culmination of a multi-year strategic pathway that began not with shipyard activity, but with deliberate political and industrial signalling between Jakarta and Paris.

In February 2022, the initial Memorandum of Understanding between PT PAL and Naval Group established a framework for submarine research, development, and industrial cooperation, signalling Indonesia’s intent to move beyond turnkey procurement models.

That framework was expanded in November 2022 with a second MoU focused on submarine energy research, including battery systems, endurance optimisation, and propulsion efficiency, reflecting Indonesia’s recognition that energy management is now the defining parameter of undersea survivability.

The partnership reached contractual maturity on April 2, 2024, when Indonesia formally signed an agreement for two Scorpène Evolved Full Lithium-ion Battery submarines to be constructed entirely in Surabaya.

The contract entered into force on July 23, 2025, unlocking full programme execution and initiating the industrial transfer mechanisms that culminated in the December steel-cutting qualification.

Valued at several billion euros, the programme is estimated to exceed €2 billion, equivalent to approximately US$2.15 billion or RM10.1 billion, once technology transfer, infrastructure development, training, and lifecycle support are factored in.

Crucially, the contract embeds comprehensive technology transfer clauses that extend beyond assembly, encompassing welding certification, hull design comprehension, combat system integration, and long-term sustainment autonomy.

This structure aligns directly with Indonesia’s Defence Industry Policy, which mandates local industrial participation as a prerequisite for strategic weapons acquisition.

Pierre Éric Pommellet, Chairman and CEO of Naval Group, characterised the contract activation by stating, “A significant milestone in the strategic alliance between Indonesia and France, which we are honoured to be a part of. Together with our strategic partner PT PAL, we will support Indonesia in its ambition to build a modern, sovereign, and resilient Indonesian naval industry for the benefit of the Indonesian Navy.”

On the Indonesian side, PT PAL President Director Dr. Kaharuddin Djenod articulated the national dimension of the programme, stating, “This step is a high commitment and trust of the Indonesian government in the capability of local engineers to advancing defence technology, especially submarine technology. The government’s commitment in realizing the independence of the defence industry is also supported by the provision of Government Capital (PMN) to fully support the whole local production of submarine at PT PAL. In the future, Indonesia is expected to be able to master submarine technology.”

The injection of Government Capital Participation (PMN) underscores that this programme is not merely a naval acquisition but a state-backed industrial transformation project.

To operationalise this transfer, Indonesian welders underwent certification training at Naval Group’s Cherbourg Welding Training Centre, while approximately 50 French experts are scheduled to embed in Surabaya to mentor more than 400 Indonesian engineers across multiple production phases.

Additional memoranda signed in June 2025 with domestic defence firms and the National Research and Innovation Agency further expanded the ecosystem, while the establishment of PT Naval Group Nusantara on July 1, 2025, institutionalised France’s long-term industrial presence in Indonesia.

Scorpène Evolved Full LiB: A Quantum Leap in Indonesia’s Undersea Warfare Capability

The Scorpène Evolved Full Lithium-ion Battery submarine represents a generational advancement over conventional diesel-electric attack submarines, redefining endurance, stealth, and operational flexibility within the shallow and congested waters of the Indonesian archipelago.

Unlike legacy lead-acid battery submarines, the Full LiB configuration offers significantly higher energy density, allowing extended submerged operations without snorkeling, thereby dramatically reducing detection risk from airborne and surface-based anti-submarine warfare assets.

Operational endurance is projected to reach 18 to 21 days at low speed, a capability that fundamentally alters patrol persistence across chokepoints such as the Malacca Strait, Sunda Strait, and Lombok Strait.

With a surfaced displacement between 1,600 and 2,000 tonnes, a length of approximately 72 metres, and a diving depth exceeding 300 metres, the Scorpène Evolved occupies a performance envelope optimised for both littoral and blue-water operations.

Submerged speeds exceeding 20 knots allow rapid repositioning, while the hydrodynamically optimised hull and advanced acoustic coatings enhance survivability against modern sonar arrays.

Armament is delivered via six 533mm torpedo tubes, supporting heavyweight torpedoes, anti-ship missiles such as the Exocet SM39, and a range of naval mines, enabling multi-mission flexibility from sea denial to intelligence gathering.

The combat management system integrates advanced sonar suites, electronic warfare systems, and optronic masts, delivering superior situational awareness while eliminating traditional periscopes that compromise stealth.

Optional integration of Air-Independent Propulsion further enhances endurance, while the modular architecture allows future insertion of indigenous Indonesian systems.

Compared to Indonesia’s existing Nagapasa-class submarines, which displace approximately 1,400 tonnes and rely on conventional batteries, the Scorpène Evolved offers superior stealth, range, and operational tempo.

The adoption of lithium-ion technology places Indonesia alongside technologically advanced submarine operators such as Japan, positioning the Indonesian Navy at the forefront of Southeast Asian undersea warfare capability.

However, lithium-ion systems also demand advanced safety protocols, thermal management expertise, and specialised infrastructure, all of which are being addressed through the ongoing technology transfer framework.

Indonesia’s Submarine Journey: From Regional Pioneer to Industrial Aspirant

Indonesia’s submarine lineage stretches back to 1959, when it became Southeast Asia’s first submarine operator with the acquisition of Soviet-built Whiskey-class boats, establishing early undersea warfare credentials.

Subsequent decades saw fluctuating capability levels due to maintenance challenges and shifting geopolitical alignments, culminating in renewed focus during the 1980s with the procurement of German Type 209 submarines.

The modern revitalisation phase began in the 2010s with the Nagapasa-class programme, valued at approximately US$1.1 billion (RM5.15 billion), which introduced structured industrial participation through cooperation with South Korea.

The assembly of KRI Alugoro at PT PAL in 2019 marked Indonesia’s first tangible step toward submarine localisation, though critical systems remained externally dependent.

The loss of KRI Nanggala-402 in 2021 underscored both the operational risks inherent to submarine warfare and the urgency of fleet modernisation.

Today, Indonesia operates three Nagapasa-class submarines, with official planning documents targeting a fleet of eight submarines under the Minimum Essential Force doctrine.

The Scorpène Evolved programme represents a qualitative leap within this expansion, transitioning from assembly participation to certified hull fabrication and long-term design comprehension.

This strategic pivot reflects broader defence policy recalibration under President Prabowo Subianto, emphasising industrial sovereignty amid tightening budgets and intensifying regional competition.

Strategic, Regional, and Industrial Implications in the Indo-Pacific Theatre

The Scorpène Evolved programme carries far-reaching implications beyond Indonesia’s naval inventory, reshaping deterrence dynamics across Southeast Asia.

As tensions persist in the South China Sea and maritime competition intensifies, enhanced Indonesian submarine capability strengthens deterrence through ambiguity, surveillance, and sea denial.

Within the regional submarine balance, Indonesia’s advancement parallels similar investments by Vietnam, Singapore, and Malaysia, reinforcing a competitive but stabilising equilibrium.

For France, the programme reinforces its Indo-Pacific strategy by anchoring long-term industrial presence and strategic influence in Southeast Asia, complementing defence ties with India and other regional partners.

Economically, the programme is expected to generate thousands of high-skill jobs, catalyse advanced manufacturing capabilities in Surabaya, and create technological spill-overs into civilian sectors such as energy storage and precision engineering.

Nevertheless, challenges remain, including schedule discipline, supply chain resilience, and sustained political commitment over multi-decade timelines.

Full production is scheduled to commence in mid-2026, with the first submarine expected to enter Indonesian Navy service by 2030, a timeline contingent on uninterrupted industrial momentum.

Future cooperation could extend to additional hulls, regional exports, or trilateral knowledge sharing, particularly with other Scorpène operators.

Steel Cut Today, Sovereignty Forged Tomorrow

The steel cutting qualification achieved on December 12, 2025, represents not merely the beginning of submarine construction but the crystallisation of Indonesia’s ambition to secure maritime sovereignty through industrial mastery.

By pairing strategic intent with structured technology transfer, PT PAL and Naval Group are building more than submarines; they are constructing an ecosystem capable of sustaining Indonesia’s undersea deterrent for generations.

As geopolitical fault lines harden across the Indo-Pacific, Indonesia’s ability to independently build and sustain submarines elevates its status from maritime stakeholder to maritime shaper.

In the unforgiving realm of undersea warfare, where invisibility equates to power, Indonesia’s entry into sovereign submarine manufacturing marks a decisive step toward enduring strategic relevance. — DEFENCE SECURITY ASIA