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The original was posted on /r/todayilearned by /u/RollingNightSky on 2024-04-10 00:50:09.

Original Title: TIL South Korea trained a secret military unit, unit 684, to assassinate North Korea’s leader. Civilians were recruited to an island where the harsh training they endured killed 7 members. Desperate to escape, the unit revolted in 1971, killing 18 guards to escape to mainland South Korea.