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Our country's first submarine was Jang Bogo. Since Jang Bogo was built in Germany and imported into Korea, it is difficult to call it a Korean submarine. 'Icheon' is a 1,200-ton submarine that Daewoo Shipbuilding & Marine Engineering completed with domestic technology using parts imported from Germany. It was commissioned in 1994 and began sailing, and has traveled 100,000 miles, equivalent to four and a half times around the Earth, without a single accident, and has successfully completed the West Pacific exercise and the ROK-US joint exercise during that time. #Submarine #Snorkel #Icheon Broadcast date: 2011. 06.23 / Program: Wonderful Science - The Strongest Secret Weapon, Submarine