Nope, wasn't a bunker buster either!

An extremely strong tube that is:
very narrow for its weight
extremely heavy

The bomb is dropped from an airplane so that this tube develops a great deal of speed, and therefore kinetic energy, as it falls.

When the bomb hits the earth, it is like a massive nail shot from a nail gun. In tests, the GBU-28 has penetrated 100 feet (30.5 meters) of earth or 20 feet (6 meters) of concrete.

In a typical mission, intelligence sources or aerial/satellite images reveal the location of the bunker. A GBU-28 is loaded into a B2 Stealth bomber, an F-111 or similar aircraft.

The bomber flies near the target, the target is illuminated and the bomb is dropped.

The GBU-28 has in the past been fitted with a delay fuze (FMU-143) so that it explodes after penetration rather than on impact:thumbsup: