Visiting the 4th Tunnel in the Demilitarized Zone – Going Underground in South Korea

In the 1960s-1980s, North Korea dug tunnels under the Demilitarized Zone (DMZ) into South Korea in an attempt to surprise attack their neighbors from underground. Depending on the size of the tunnel it could funnel 10,000-30,000 soldiers an hour and some are big enough for vehicles as well.

Unfortunately for North Korea, the tunnels were discovered.

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