The massive effort to identify the victims of the World Trade Center collapse — once shelved to wait for better technology — has reopened thanks to a Springfield labarotory.

The Bode Technology Group initially had a contract with New York authorities to examine some 30,000 skeletal remains found in the rubble after the Sept. 11 attacks. But the heat and refuse of the mass grave made DNA difficult to extract and the remains were put into deep-freeze, Bode general manager Maureen Loftus said.