STM flags project milestones for Turkish Preveze and Gür-class subs

Turkish shipbuilder STM Savunma Teknolojileri Mühendislik ve Ticaret A.Ş has marked construction milestones for Turkish Navy’s Preveze-clas and Gür-class submarines.


STM has completed two significant steps in the ongoing Preveze-Class and Gür-Class submarine projects, which are the backbone of the Turkish Submarine Fleet.

The Preveze-class Submarine Half-life Modernisation (PREVEZE-YÖM) Project, initiated by the SSB, has passed another notable milestone. Following the successful sea acceptance trials of the inertial navigation system, CTD probes, cooled water systems and static inverters, required to be delivered after the design stages, STM received the approval of the SSB on 2 March 2023.

STM received the contract in 2022 under the PREVEZE-YÖM project for the modernization of four Preveze-class (S-353) submarines.


The Half-life Modernisation Project of Preveze-class submarines covers the modernisation of the TCG Preveze (S-353), TCG Sakarya (S-354), TCG 18 Mart (S-355) and TCG Anafartalar (S-356) submarines in the inventory of Naval Forces Command.

The company has been serving as the main partner in the project since signing a contract on 8 February, 2019, and is currently engaged in activities as the responsible party for the supply of nine systems and platform integration works under the project.

Meanwhile, STM also signed a contract with TÜBİTAK Bilgem in February 2023 under which it will carry out the platform integration of the Advent-Müren combat management system aboard Gür-class submarines.

TÜBİTAK Bilgem and Naval Forces Command signed a protocol on 5 December 2022 for the Advent-Müren combat management system and AKYA Integration project for Gür-class submarines.

Preveze- and Ay-class submarines that have been equipped with the MÜREN combat management system have now been provided with the national torpedo AKYA firing capability.

Under a contract signed between TÜBİTAK Bilgem and Naval Forces Command, Gür-class submarines will be provided with this capability and modernized with the indigenous combat management system.

“Our qualified workforce and technologies allow us to carry out significant projects related to the submarine platforms of the Turkish Navy, and those of friendly and allied nations. Among these is the PREVEZE-YÖM Project, under which we have successfully completed the acceptance tests of four systems. We have now signed a new contract with TÜBİTAK BİLGEM to transfer the engineering experience gained in the Ay- and Preveze-Class submarine modernization projects to Gür-Class submarines,” Özgür GÜLERYÜZ, General Manager of STM said.

Undertaking crucial tasks in the submarine modernisation and construction projects of the Turkish Navy, STM successfully completed the modernisation of two Ay-class submarines in its role as main contractor in 2015.

Continuing its system supply and platform integration activities as a pilot partner in the modernisation of four Preveze-class submarines, STM has also been serving since 2016 as the main contractor in the modernisation of the French-made Agosta 90B Khalid-class submarines owned by Pakistan. Deliveries of the first two submarines in the Agosta 90B Modernisation project have been completed, and STM is continuing the modernisation works on the third submarine in Pakistan.