Meant tunnels, used wrong word.
Its a serious situation and hardly worthy of all the silliness people are up to here. The base I was at was right on the yellow sea. You could look out and see NK fishing boats loaded with antennas (spy boats). The perimeter was loaded with cannon, missile launchers, artillery and the beach was mined.
One side of the base was off limits at night and you stood a very good chance of getting shot by the SKs if you went there.
Most SK people expect a war to break out sometime but they do hope it doesnt happen.