Please remember, after the first few days, they had to bury the crater so that they could get the heavy equipment in there to remove the large debris to look for more victim remains. In fact, the last 2-3 victims were not removed until after the building was imploded and and almost all of the debris was removed. So the crater was only there for a few days. It will not be depicted in any of the photos taken after the first couple of days. I remember discussions about it being photographed and examined and excavated for evidence quickly so that it could be covered over to allow those heavy cranes to move into place.