Deputy U.S.Marshal Dominic Guadagnoli, top, and medical personnel talk to Donna Spera who was in the crowded 78th floor elevator lobby of the South Tower when the hijacked United Airlines Flight 175 flew into the building. It was the deadliest place in the south tower: About one-third of the 611 people who perished in the building died there. Just 12 people including Donna who were in the elevator lobby when the second jet hit escaped before the south tower collapsed 56 minutes later.