[–] Unchosen1 [S] 0 points 1 point 1 point (+1|-0) ago
It didn't. It disappeared. There is barely any debris at ground zero, even on the same day. The "bathtub" the towers sat in was 7 stories deep and largely undamaged. 300+ stories worth of building disappeared without enough heat or seismic activity to account for its disappearance and all that was left wasn't even enough to fill the lobby.