Haha, that and it could easily wipe out entire cities, states, and small countries... Its 400 meters, thats not the biggest ever, but its more than big enough to fuck shit up. The one that killed off the dinosaurs was like 10km across, and it left a crater 110 miles in diameter. The one that exploded  several km above siberia and leveled 800 square miles of forest was (don't know remember exactly how big it apparently was) a good bit smaller than 400 meters. At 400 meters, some serious shit would go down if it hit or blew up above any population center.