In the 1990s, an estimated 30,000 prisoners were in the lifetime area, and around 16,500 prisoners in the revolutionizing zone (many of them family members of prisoners and people repatriated from Japan).
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The whole encampment is surrounded by a barbed-wire fence measuring 3 to 4 meters and walls 2 to 3 meters tall topped with electrical wire. Along the fence there are watchtowers, and patrolled by 1,000 guards armed with automatic rifles, hand grenades and guard dogs.
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