北朝鮮 第４南侵トンネル The fourth North Korean tunnel

The fourth North Korean tunnel was discovered on March 3, 1990 northeast of the small city of Yanggu in the remote Punchbowl area of Gangwon province. Surprisingly a week later the North Koreans actually admitted to constructing the tunnel in order to "facilitate peaceful reunification".

After detecting the sound of underground motors in May of 1989, the Army started excavation work using state-of-the-art reconnaissance devices developed by the Korean Institute for Science and Technology. They sent electric waves through antennas, which were put through excavation halls driven every 20 meters. Analyzing the transformation of the waves, they were able to pinpoint the tunnel's location as well as determine its size. Twenty-three days after they started digging, the counter-tunnel reached the North Korean tunnel. Forty-five Korean and foreign journalists were present at the scene of discovery of the fourth tunnel on March 3, 1990. The tunnel is 145 meters below the surface and is 2,052 meters long. It is located 26 km northeast of Yangku. The tunnel could allow the transit of some 30,000 soldiers per hour.

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