“The crossing marked the second embarrassing breach for the South Korean military’s border security in recent months. In November, another North Korean man, a former gymnast, crawled over the border fence and was not captured until he was half a mile south of the border. The military later said that sensors supposed to trigger alarms that alert South Korean guards malfunctioned because of loose bolts:” reports the New York Times.
History & Heroes Of the Korean DMZ: 1953 to Today