... the fireballs function alongside a 2,000 pound BLU-109B bunker bomb, Flight Global reports. These bunker bombs are able to punch through six feet reinforced concrete. After punching into a bunker, the bomb would then release its internal kinetic incendiaries. Once inside a bunker or structure, the rocket balls get to work. Essentially, the balls are hollowed out spheres comprised of rubberized rocket fuel that have a hole on the outside. As Technovelgy notes, this hole causes the balls, once ignited, to expel hot air in excess of 1,000 degrees Farenheit