War tensions have been high since last week's announcement by the South Korean government that a 60-foot North Korean submarine fired a torpedo that sank a South Korean corvette and killed 46 sailors at the end of March. The South Koreans stated that a Yeono-class (alternatively spelled "Yono") midget submarine fired the torpedo in March. (They also field a larger midget submarine, the Sang-O, that fits 15 sailors. At least one of these subs was also on patrol when the attack happened, according to an international team of investigators looking into the incident with South Korea.) The attack occurred in...