The modernisation of the TCG “Doğanay” and TCG “Dolunay” submarines of the Naval Forces Command was accomplished following the modernisation activities carried out by the Savunma Teknolojileri ve Muhendislik A.S. (STM) over the last 4.5 years.

 With this project conducted by STM, the most vital battle and navigation systems of the submarines were modernised and delivered to the Naval Forces Command.