(DEFENCE SECURITY ASIA) — Türkiye’s national heavyweight torpedo, AKYA, split a decommissioned warship into two structural sections during a live-fire test on June 11, 2026, marking the definitive end of Ankara’s decades-long reliance on imported German and American underwater weapons.

Fired from the submerged Preveze-class submarine TCG Sakarya at a range of roughly ten kilometres, the ROKETSAN-built torpedo struck the former NATO command vessel ex-TCG Sokullu Mehmet Paşa with sufficient underwater shock energy to break its keel and send it to the seabed within minutes.

The strike, executed during the Distinguished Observers Day segment of the DENİZKURDU-II 2026 exercise spanning the Black Sea, Aegean, Marmara, and Eastern Mediterranean, was witnessed by senior Turkish military leadership overseeing Ankara’s rapidly expanding indigenous naval arsenal.

Admiral Ercüment Tatlıoğlu, Commander of the Turkish Naval Forces, called the launch a moment of justified national pride in having nationalized the torpedo, the primary weapon of Türkiye’s submarine arm, a declaration carrying deep symbolic weight for Ankara’s defence-industrial establishment.

This single underwater detonation carries geopolitical consequences far beyond the exercise itself, signalling that Türkiye’s submarine force can now fight anti-submarine and anti-surface engagements without depending on Berlin’s DM2A4 SeaHake or Washington’s Mk 48 heavyweight torpedoes.

The timing is strategically loaded, arriving as Ankara pursues an assertive “Blue Homeland” maritime doctrine across roughly 462,000 square kilometres of contested waters claimed against Greece and the Republic of Cyprus.

For policymakers in Athens, Nicosia, Washington, and Brussels, the AKYA firing functions as a calibrated signal that Türkiye’s underwater warfare ecosystem — sensors, combat management, and munitions — now sits entirely under sovereign Turkish control.

The same exercise day featured a record volume of indigenous guided-munitions firings, including an ATMACA anti-ship missile launched from TCG Burgazada at an unprecedented range of approximately 102 kilometres, reinforcing Ankara’s message of compounding technological momentum.

Presidency of Defense Industries President Haluk Görgün and Chief of General Staff General Selçuk Bayraktaroğlu both publicly praised the systems’ performance, framing the exercise as evidence of Türkiye’s deepening deterrence credibility on NATO’s southern flank.

Beyond symbolism, the AKYA’s integration with the indigenous MÜREN combat management system aboard the modernized TCG Sakarya represents the first genuinely sovereign underwater kill-chain fielded by a NATO submarine force outside the traditional German-American supply axis.

This development matters commercially and militarily far beyond Turkish waters, since reported discussions with Pakistan over arming the new Hangor-class submarines with AKYA could extend Ankara’s defence-industrial reach into the Arabian Sea and Indian Ocean theatre.

What follows is a detailed strategic breakdown of the AKYA firing’s military mechanics, its technical edge over legacy Western torpedoes, and its far-reaching consequences for Mediterranean, Black Sea, and Indo-Pacific security calculations.

Inside the June 11 SINKEX: Operational Breakdown and the MÜREN Integration

The June 11 engagement was structured as a SINKEX, a live sinking exercise in which a decommissioned vessel serves as a real kinetic target rather than a simulated one, generating data unattainable through synthetic testing alone.

Ex-TCG Sokullu Mehmet Paşa began life as the West German Rhein-class tender FGS Donau, built in 1960, before entering Turkish naval service in 1997 and being decommissioned in February 2024 as a NATO SNMCMG-2 command platform.

Selecting a former NATO command ship as the target, whatever the underlying operational necessity, symbolically underscored the transition of a once allied-integrated vessel into a demonstration of purely national Turkish strike capability.

TCG Sakarya, a Preveze-class Type 209/1400 diesel-electric submarine currently undergoing mid-life modernization, fired the torpedo from a submerged position at approximately ten kilometres, or five nautical miles, from the target hull.

This marked the first operational firing of AKYA integrated with MÜREN, the Milli Üretim Entegre Sualtı Savaş Yönetim Sistemi, Türkiye’s indigenous National Integrated Underwater Combat Management System now replacing legacy foreign combat suites.

MÜREN’s integration is the less-publicized but arguably more consequential element of the test, because a torpedo’s lethality ultimately depends on the fire-control system’s ability to generate an accurate firing solution beforehand.

Video released by the Turkish Ministry of National Defence showed the target vessel breaking into two structural sections, consistent with a proximity-fuzed underwater shock detonation beneath the keel rather than a direct-impact hit.

This keel-breaking effect, often described in torpedo warhead design as a bubble-jet phenomenon, generates an expanding gas bubble beneath the hull that snaps a ship’s structural backbone far more efficiently than a contact explosion.

The June 2026 firing was only the second live warhead engagement against a genuine surface target, following the 27 December 2023 test from submarine TCG Preveze that sank the decommissioned ex-TCG Gazal.

Two successful SINKEX engagements within roughly thirty months indicate Türkiye has moved AKYA decisively from developmental trials into a validated, repeatable operational capability rather than a one-off demonstration weapon.

Technical Profile: AKYA’s Engineering Edge Over DM2A4 and Mk 48

AKYA is a 533-millimetre, or 21-inch, heavyweight torpedo measuring approximately seven metres in length and weighing between 1,200 and 1,500 kilograms depending on configuration, matching NATO-standard tube dimensions across allied submarine fleets.

Its warhead carries between 350 and 380 kilograms of insensitive munition, engineered to detonate via proximity or impact fuzing to maximize the keel-breaking underwater shock effect demonstrated against ex-Sokullu Mehmet Paşa.

Propulsion relies on a brushless direct-current electric motor driving counter-rotating propellers, powered by a high-energy chemical or lithium-based battery pack that ROKETSAN engineers optimized for both speed and acoustic signature reduction.

Official figures cite a range exceeding fifty kilometres and a top speed above forty-five knots, performance metrics broadly comparable to the German DM2A4 SeaHake and the American Mk 48 that it is designed to replace.

Guidance architecture combines fiber-optic wire-guidance with autonomous onboard modes, layered with active and passive sonar homing that includes acoustic counter-countermeasure logic intended to defeat enemy decoys and noise-jamming systems.

A dedicated wake-homing mode allows AKYA to track a surface vessel’s propeller wake independently of active sonar emissions, reducing the torpedo’s detectability during the terminal phase of an anti-surface engagement.

This dual anti-submarine and anti-surface targeting profile gives Turkish submarine commanders tactical flexibility rarely available in single-role torpedo designs, allowing one weapon stock to service both ASW and ASuW mission profiles.

The weapon is cleared for integration across Türkiye’s Preveze-class, Gür-class, and Reis-class Type 214TN submarines, with clear design intent to eventually arm the future indigenous MİLDEN-class boats once construction matures.

No official unit cost or total program budget for AKYA has been publicly disclosed by ROKETSAN or the Turkish Ministry of National Defence, leaving analysts to estimate cost-effectiveness against imported alternatives without verified figures.

Absent transparent pricing data, comparative cost analysis against the German DM2A4 SeaHake and the American Mk 48 — both broadly estimated in defence-industry literature at low-to-mid single-digit millions of US dollars, or roughly RM4 million to RM20 million per unit — remains speculative.

Strategic Autonomy: Ending Dependence on Foreign Torpedo Suppliers

For decades, Türkiye’s submarine fleet depended on German-supplied DM2A4 SeaHake and earlier American Mk 48 torpedoes, exposing Ankara’s underwater warfare capability to foreign export licensing decisions and potential political leverage.

Germany’s history of arms-transfer restrictions toward Türkiye, driven by disputes over Cyprus, Kurdish policy, and broader European Union relations, made heavyweight torpedo supply a recurring vulnerability within Turkish naval planning circles.

AKYA’s operational fielding severs this dependency chain, granting Türkiye sovereign control over production, maintenance, software updates, and munition stockpiles without requiring foreign government approval for resupply or technical modification.

Combined with the indigenous MÜREN combat management system now aboard modernized Preveze-class submarines, Türkiye has effectively closed the loop on a fully domestic underwater warfare kill-chain spanning sensors, fire control, and munitions.

This mirrors Ankara’s broader defence-industrial strategy visible in the ATMACA anti-ship missile, the HİSAR-D naval air-defense system, and various indigenous drone programs, all designed to insulate Turkish military power from sanctions-driven supply risk.

Strategic autonomy of this kind directly strengthens Türkiye’s negotiating leverage within NATO procurement discussions, since Ankara no longer requires unanimous allied consensus to sustain its submarine force’s primary offensive weapon system.

The AKYA program traces back to 2009 under the Turkish Navy’s ArMerKom research command, with test firings beginning in 2013, trials concluding by 2020, and serial production commencing in 2021, reflecting a methodical seventeen-year indigenization timeline.

That extended development arc illustrates the genuine technical difficulty of heavyweight torpedo engineering, a field historically dominated by only a handful of nations, including Germany, the United States, Russia, and Italy.

Türkiye’s successful entry into this restricted club elevates its status among mid-tier naval powers and positions ROKETSAN as a credible heavyweight-torpedo exporter competing against established Western and Russian suppliers.

Serial production now underway suggests Türkiye can equip its expanding submarine fleet, including future Type 214TN Reis-class boats, without the multi-year procurement delays historically associated with foreign government-to-government torpedo sales.

Blue Homeland Doctrine and the Aegean–Black Sea–Mediterranean Power Calculus

The AKYA firing directly reinforces Türkiye’s “Mavi Vatan,” or Blue Homeland doctrine, which asserts expansive maritime jurisdiction across roughly 462,000 square kilometres of the Aegean, Eastern Mediterranean, and Black Sea.

A submarine fleet capable of independently executing lethal underwater strikes without foreign munitions dependency materially raises the operational credibility of Türkiye’s maritime claims in disputes with Greece and the Republic of Cyprus.

In the Eastern Mediterranean specifically, contested hydrocarbon exploration zones and overlapping continental-shelf claims mean that submarine-launched heavyweight torpedo capability directly affects the risk calculus facing energy-exploration vessels and their naval escorts.

Greek naval planners must now factor an operationally validated, fifty-kilometre-range Turkish heavyweight torpedo into any contingency modelling for Aegean submarine engagements, altering assumptions that once rested on imported and potentially restricted Turkish munitions.

In the Black Sea, AKYA’s fielding arrives amid persistent regional tension over access through the Turkish Straits under the Montreux Convention, adding another dimension to Ankara’s already pivotal gatekeeper role.

Türkiye’s growing indigenous strike capability across submarine, missile, and air-defense domains positions Ankara as NATO’s most operationally assertive southern-flank member, capable of independent maritime power projection without requiring allied logistical support.

This assertiveness carries a dual-edged geopolitical character, simultaneously strengthening NATO’s collective deterrence posture in the Black Sea while also reinforcing Ankara’s capacity to pursue unilateral maritime claims contested by fellow alliance member Greece.

Regional naval planners in Athens and Nicosia are likely to interpret the SINKEX footage, showing a target ship’s keel broken in a single strike, as a deliberate signalling exercise rather than routine weapons testing.

Historical precedent suggests visible displays of validated lethality during large-scale exercises tend to accelerate reciprocal naval procurement cycles among rival Aegean and Eastern Mediterranean states, a dynamic already visible in recent Greek submarine and frigate acquisitions.

Left unmanaged, this technology-driven signalling risk contributes to a slow-building undersea arms competition in semi-enclosed waters where limited manoeuvring space already compresses response times and elevates the danger of miscalculation.

NATO Dynamics, Export Potential, and the Risk of a Wider Arms Race

Within NATO’s internal procurement architecture, Türkiye’s shift toward a fully sovereign torpedo supply chain reduces interoperability friction points previously tied to German export licensing delays affecting joint submarine readiness commitments.

Yet full national control over AKYA’s software, encryption, and targeting algorithms could simultaneously complicate data-sharing and joint operational planning with allied navies accustomed to standardized Western torpedo protocols and maintenance regimes.

Reports of Turkish-Pakistani discussions over equipping Pakistan’s new Hangor-class submarines with AKYA point toward a potential Turkish entry into South Asian and Indian Ocean underwater warfare markets historically dominated by Chinese and French suppliers.

Should this export materialize, Pakistan’s navy would gain a heavyweight torpedo option independent of Chinese supply chains, a shift with direct implications for the India-Pakistan naval balance across the Arabian Sea.

Indian naval planners would likely respond by accelerating their own indigenous heavyweight torpedo programs, given New Delhi’s longstanding sensitivity to any capability shift favouring Islamabad’s underwater warfare posture along contested maritime boundaries.

This potential export relationship also extends Ankara’s defence-industrial influence beyond its traditional Mediterranean and Black Sea theatre into Indo-Pacific-adjacent waters, aligning with Türkiye’s broader ambition to become a global mid-tier arms exporter.

ROKETSAN’s parallel development of the ORKA lightweight torpedo suggests Ankara intends to offer a complete indigenous underwater weapons portfolio to export customers rather than a single standalone heavyweight system.

For NATO planners, the central unresolved question is whether Türkiye’s growing weapons autonomy strengthens the alliance’s collective Black Sea deterrence or instead accelerates Ankara’s independent strategic decision-making outside consensus-based allied frameworks.

Uncertainty also persists regarding AKYA’s real-world performance against manoeuvring, countermeasure-equipped adversary submarines, since public testing to date has involved stationary or slow decommissioned surface targets rather than contested submarine-versus-submarine engagements.

Until AKYA is tested against a genuinely evasive, countermeasure-employing submarine target, independent verification of its claimed acoustic counter-countermeasure performance and battlefield reliability will remain an open analytical question for defence observers worldwide.