The Hybrid powered Type 214TN REİS Class Submarines, which constitute one of the significant turning points in the Turkish submarine history which spans 134 years, has a quieter hull design, reduced flow noise as well as a lower acoustic, thermal and magnetic signature compared to the diesel/electric propelled diesel/electric powered AY (Type 209/1200), PREVEZE (Type 209/1400) and GÜR Class (Type 209/1400-Mod) Submarines in the inventory of the Turkish Naval Forces Submarine Group Command. Moreover, thanks to their PEM Fuel Cell (2x120kw) based an Air Independent Propulsion (AIP) System and high capacity batteries (2x324 units), they can conduct long-endurance operations (from 4 days to 3 weeks) without the need for snorkeling. With its superior features such as the ability to cross the Mediterranean underwater without snorkeling and sailing to the USA without refueling, REİS Class Submarines further enhance the operational activities and capabilities of the Turkish Naval Forces in the surrounding seas, especially in the Aegean and the Eastern Mediterranean.