South Korean troops failed to notice a North Korean man who crossed the heavily fortified border this month even though he appeared on TV cameras eight times and triggered alarms. South Korea’s army said it would take this moment to make necessary changes. The man swam in from the sea in a wet suit, walked 5km and spent three hours undetected before troops finally took action on his ninth TV appearance. It is unclear why he made the crossing via such a dangerous route. At one point the man passed through a drainage tunnel in the demilitarised zone (DMZ) the South Korean military did not even know existed, the Yonhap news agency reported.This is despite the zone being one of the most heavily fortified and sensor-dominated in the world.(BBC)…[+]