North Korea uses concrete traps in the DMZ: https://99percentinvisible.org/article/hostile-terrain-tank-traps-fake-towns-secret-tunnels-korean-borderlands/ http

North Korea uses concrete traps in the DMZ: https://99percentinvisible.org/article/hostile-terrain-tank-traps-fake-towns-secret-tunnels-korean-borderlands/ https://99percentinvisible.org/article/hostile-terrain-tank-...