There's a mysterious tunnel in Seoul, South Korea. Not many of the South Koreans are aware of this tunnel. The people who live near this end of the tunnel have no idea who dug it, when it was dug, where it leads to, and how far. A few believe that it could be North Korean. So far, South Korea has officially discovered four of the North Korean incursion tunnels near the DMZ border. It's assumed that there are many more undiscovered tunnels. No North Korean tunnel reaching the capital city has been officially discovered (yet).
