No body/tank is getting through the ironically named Demilitarized Zone dividing South and North Korea, without getting lit up with fast moving pieces of metal

No body/tank is getting through the ironically named Demilitarized Zone dividing South and North Korea, without getting lit up with fast moving pieces of metal hitting with high kinetic energy. Hence the tunnels. North Korean government's long standing, highest priority goal is conquest of South Korea through any means, including military invasion.