Meanwhile , Gédéon filmed Benetatos ( by now , the only firefighter left in the firehouse ) taking calls from the other departments , but eventually took to the streets out of worry for Jules . He walked for some time , filming people 's reactions and the damage done by flying debris , and managed to film the impact of United Airlines Flight 175 into the South Tower . Realizing that he could not get any closer to the WTC , he returned to the firehouse , where he filmed the arrival of various off-duty firefighters . He caught the arrival of retired Battalion 1 Chief Larry Byrnes , but was unable to follow him and Benetatos as they left for the WTC . Gédéon resumed filming the people 's reactions as the South Tower collapsed before returning to the firehouse and joining a trio of off-duty firefighters as they headed out to the disaster area . Unable to follow the firefighters to the North Tower , he remained in the area and filmed his surroundings
United Airlines Flight 175
United Airlines Flight 175
Jules and Gédéon Naudet