ROKS Na Dae-yong
ROKS Na Dae-yong (SS-069) is the eighth boat of the Jang Bogo-class submarine of the Republic of Korea Navy.At the end of the 1980s the South Korean navy started to improve its overall capability and began to operate more advanced vessels.These boats are generally similar to Turkey's six Atilay-class submarines, with German sensors and weapons.[1] The first order placed late in 1987 covered three boats, one to be completed in Germany and the other two in South Korea from German-supplied kits.The older boats were upgraded, it is believed that the modernization included a hull stretch to the Type 1400 length, provision for tube-launched Harpoon missiles and the addition of a towed-array sonar.