South Korea\'s Navy launched its fourth 1,800-ton Type 214 submarine in a ceremony here on Tuesday as part of efforts to boost its underwater warfare capabilities against North Korean submarines. The ship, named after Korea\'s famous independence fighter Kim Jwa-jin (1889-1930), is the fourth of its kind in operation since 2010. Kim is Korea\'s first general of independence fighters who led the Cheongsan-ri battle to defeat 3,300 Japanese soldiers in China\'s northeastern region in 1920.c