Thousands of detectives and forensic evidence specialists worked for over 1.7 million hours at Fresh Kills Landfill to try to recover remnants of the people killed in the attacks. A final count of 4,257 human remains was retrieved, but only 300 people were identified from these remains. A memorial was built in 2011, which also honors those whose identities were not able to be determined from the debris. The remaining waste was buried in a portion of the landfill; it is highly likely that this debris still contains fragmentary human remains.