ANKARA, — April 13, 2026 : The Turkish Naval Forces have equipped a Reis-class submarine with a Dry Deck Shelter (DDS) module, enabling submerged deployment of SAT (Sualtı Taarruz) commandos, according to footage and official statements released on April 13, 2026 showing the submarine operating at sea.
The integration marks a functional expansion of Turkey’s New Type Submarine Project, also known as the Reis-class or Type 214TN program, which forms the backbone of the country’s next-generation conventional submarine fleet.
Program Background and Industrial Structure
The Reis-class submarines are license-built derivatives of Germany’s Type 214 design, developed under cooperation with ThyssenKrupp Marine Systems (TKMS). Construction is being carried out at Gölcük Naval Shipyard, with Turkish industry providing substantial subsystem integration.
Domestic defense firms STM and Aselsan are responsible for key structural sections and onboard electronics, including locally integrated sensors and combat systems. The program reflects a hybrid model combining foreign design support with indigenous manufacturing and system integration.
A total of six submarines are planned under a contract signed in 2009, valued at approximately €2.06 billion. Deliveries are scheduled to continue through 2029.
Platform Specifications and Capabilities
Each Reis-class submarine measures approximately 68.5 meters in length and has a submerged displacement of around 2,040 to 2,050 tons. The vessels are capable of reaching a maximum submerged speed of about 20 knots.
A defining feature of the class is its air-independent propulsion (AIP) system based on proton exchange membrane (PEM) fuel cells. This allows the submarines to remain submerged for extended durations—potentially several weeks—without snorkeling, significantly reducing detection risk.
The submarines are equipped with eight 533 mm torpedo tubes capable of launching heavyweight torpedoes, guided missiles, and naval mines. The standard crew complement is 27 personnel, with additional capacity for up to 11 SAT commandos.
The class integrates the ISUS 90-72 sonar and weapon control system, combined with Turkish-developed electronic subsystems. The submarines are designed to replace the Preveze-class fleet and precede future indigenous submarine programs under the MILDEN project.
Fleet Status and Timeline
The first submarine, TCG Pirireis (S-330), was commissioned on August 24, 2024, at Aksaz Naval Base. The second unit, TCG Hızırreis (S-331), entered service in December 2025.
The third submarine, TCG Muratreis (S-332), was launched in May 2025 and is undergoing outfitting and trials. Three additional boats—TCG Aydınreis, TCG Seydi Ali Reis, and TCG Selman Reis—are in various stages of construction or outfitting, with deliveries planned through 2029.
While official sources have not confirmed which specific submarine has received the DDS in the latest rollout, earlier references indicate that TCG Pirireis has previously operated with a SAT commando container.
Dry Deck Shelter Integration
The Dry Deck Shelter (DDS) is a modular, externally mounted structure attached to the submarine’s deck. It provides a sealed, pressurized environment connected to the submarine’s hull via an access trunk.
This configuration enables SAT personnel to prepare equipment within the shelter while the submarine remains submerged. A lockout chamber allows divers to exit and re-enter the submarine underwater at periscope or shallow depths without requiring the vessel to surface.
The DDS can support deployment of swimmer delivery vehicles (SDVs), combat diving gear, and small insertion craft. By maintaining a closed pressure environment, the system preserves both acoustic and visual stealth during special operations missions.
Operational Role of SAT Commandos
SAT (Sualtı Taarruz) commandos are the Turkish Navy’s specialized maritime special operations unit. Their mission profiles include underwater demolition, amphibious reconnaissance, sabotage of maritime infrastructure, and direct-action operations in coastal environments.
The Reis-class submarines were designed with provisions to carry SAT teams. The addition of the DDS expands deployment methods beyond torpedo-tube launches or surface-based insertions, enabling more flexible and covert operational options.
Strategic and Regional Context
The DDS-equipped Reis-class submarines are expected to support covert maritime operations in the Black Sea and the eastern Mediterranean. These regions are characterized by dense naval activity, contested maritime zones, and strategic chokepoints.
The combination of AIP-enabled endurance and DDS-supported special operations capability allows the Turkish Navy to conduct extended submerged missions while maintaining a reduced operational signature.
Program Significance
The integration of the Dry Deck Shelter reflects a standard capability enhancement seen in submarines configured for special operations support across multiple navies. Within the Turkish context, it aligns with broader naval modernization efforts focused on survivability, endurance, and multi-role operational flexibility.
The Reis-class program continues to progress with ongoing sea trials, system integration, and phased delivery of remaining submarines through the end of the decade.
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