Third Tunnel of Aggression

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The Third Tunnel of Aggression is a tunnel under the border between North Korea and South Korea.

Only 44 km from Seoul, the Third Tunnel of Aggression was discovered in October of 1978. It is 1.7 km long, 2 m high and 2 m wide. It runs through bedrock at a depth of about 73 m below ground. It is apparently designed for a surprise attack on Seoul from North Korea, and can easily accommodate a full division per hour along with their weaponry. A total of four tunnels have been discovered so far, but there are believed to be up to ten more. South Korean and U.S. soldiers regularly drill in the DMZ in hopes of finding more. Its description as a tunnel of aggression was given by the south, who considered it an act of aggression on the part of the north. North Korea tried to downplay the shaft, officially declaring it part of a coal mine. Black coal was "painted" on the walls to help confirm this statement. Coal is never found deep in bedrock. Additionally, observed drill marks for dynamite in the walls point towards South Korea. Photos are forbidden within the tunnel, which is now well guarded. The South Koreans have blocked the actual Military Demarcation Line in the tunnel with three concrete barricades.

The tunnel can be visited as part of various tourist tours of the DMZ from Seoul.

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