 Here we have a video of a bunker buster bomb test. They have an arch set up to represent the three or four feet of concrete that the average bunker would be built with. The bomb slams into the top of it and propels the munitions down through the four feet of concrete into the "bunker" area where a dummy plane is stored. You can actually see the munition package shoot down near the ground before exploding. I would have to say that their bunker buster worked pretty good and this isn't even the shaped nuclear variant.
Watch this test bunker buster destroy a plane. Source: Big-boys.com | 
