The bunker buster bomb is a very large bomb that either blows up the bunker by exploding directly on top of it (if the bunker is at ground level), Or if the bunker is a few feet below ground, the bomb will go through the dirt and explode in the general area of the bunker and destroy it. The bunker bombs of today, that are dropped by the F-15E Eagle, are much more powerful than the bunker buster bombs that were dropped in WWII by the English Avro Lancaster bomber.