Fifteen years ago, on Dec. 3, 2009, the tragic Worcester Cold Storage warehouse fire devastated the city of Worcester and galvanized the nation. The tragedy began when two firefighters entered the windowless, maze-like building in search of two homeless residents who were believed to be inside. When they became lost, two other firefighters were sent in to look for them. A third team entered the building when the rescuers, themselves, became disoriented in the dense smoke. Ultimately, all six firefighters perished.