With the arrival of Russian submarines in the 70's and finding out about the defects of these submarines, Iranian experts felt the urge to master the submarine construction technology. Therefore, efforts were made to acquire submarine technology in various categories in accordance with domestic needs. After about a decade of scientific studies, Ghadir, which was one of the first important results of these efforts and was in the light class, was given to Islamic Republic of Iran Navy (NEDAJA).This submarine is designed and built in accordance with the climatic conditions of the Persian Gulf and the Sea of Oman. Also, we should mention the conquering submarines in the middle class, which are more tactical than the Ghadirclass subs and have a very high defense capacity, which has made this class of submarines a surprise for the enemies.