Bunker Buster bombs like the GBU-57 or Massive Ordnance Penetrator are “the” way that the US can reach the hardened bunkers of its adversaries be that underground or in cave networks. However, concrete technology has come on a long in recent decades and now poses the possibility that even the biggest bunker buster might not work without going nuclear. So in this video, we look at how you can punch through 6 meters of hardened concrete and can they ever be stopped.