ROKS Chang Bogo (SS-061) is a submarine of the Republic of Korea Navy, and was the first submarine to serve with that navy. She is one of the Type 209 submarines built for export by Germany At the end of the 1980s South Korean navy started to improve its overall capability and began to operate more advanced vessels. South Korea purchased its first submarines, German U-209 class in its Type 1200 subvariant, ordered as the Chang Bogo class. These boats are generally similar to Turkey's six Atilay-class submarines, with German sensors and weapons.