The 2nd Tunnel was discovered in an area 13km north of Cheorwon within the DMZ on March 19, 1975. As arch of rocks, it has 2.1m width, 2m height, 3.5km length and located between 50 and 160m (160 and 520ft) below ground. About 30,000 armed troops could infiltrate through the tunnel in an hour with vehicles, artillery pieces, and even tanks. It's Available to explore 500m length of the tunnel for now and accessible to nearest Southern...