there is still hope that there are survivors underneath all that rubble. >> 13,000 tons of debris trucked out of there and some 1,400 dump truck loads brought to the land phil over on staten island where fbi agents and nypd detectives are going through that rubble. >> you can only imagine how gruesome the task is to recover remains. in a building hit by an airplane. which makes obviously recovery, you know, much more difficult. >> i think the country felt much better that the debris was being rapidly removed. at the same time, it wasn't good for the scientific identification, collection of evidence. >> all the debris that was left was then taken out of the building and brought to a sifting area where it was gone through again. that kind of destruction -- >> when there's a major accid t accident, body parts of department phied exactly where