Third Tunnel of Aggression, Military tunnel at North Korea-South Korea border.
The Third Tunnel of Aggression is an underground passage running beneath the demilitarized zone, discovered by South Korean forces after suspicious activity. The corridor measures roughly 2 meters in width and height, extending over 1,600 meters deep with three concrete barriers blocking further access.
The tunnel was discovered in 1978 after South Korean forces detected suspicious explosions in the demilitarized zone. It remains interpreted as evidence of northern military preparations and the ongoing security threats on the peninsula.
The tunnel functions as a place where visitors directly encounter the divided history of the peninsula through their own steps underground. Walking through these passages makes the political reality tangible in a way exhibits alone cannot.
Visitors can explore the tunnel on foot or by small train, with mandatory safety helmets provided for all. Guided tours are organized regularly to keep groups moving safely through the passage.
The tunnel contains three massive concrete barriers installed by South Korea to block further passage. These walls stand as physical reminders of the division that defines the peninsula today.
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