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Since 15 November 1974, S Korea has discovered tunnels, up to 1,600m long/73m deep, crossing the DMZ that had been dug by N Korea. N Korea claimed that the tunnels were for coal mining; no coal was found. Some of the tunnel walls were painted black to give the appearance of anthracite.

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Fun Fact: Since 15 November 1974, S Korea has discovered tunnels, up to 1,600m long/73m deep, crossing the DMZ that had been dug by N Korea. N Korea claimed that the tunnels were for coal mining; no coal was found. Some of the tunnel walls were painted black to give the appearance of anthracite.

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