On September 11, 2001, an American Airlines flight struck World Trade Center Tower 1. Rick Rescorla, a director of security for World Trade Center Tower 2, had heard the crash and saw the burning tower from his office window. He and his employees were ordered to remain calm and to stay at their desks but Rescorla disregarded the order and began to evacuate people from the building. The employees of the building knew what to do in a situation like that because they had been practicing an emergency evacuation plan that Rescorla had created for many years. During the evacuation, he sang songs to try and keep the employees calm. When the group of employees he had been leading to the exit got out safely, he reentered the building to make sure there was no one still inside. He was last seen going up to the 10th floor shortly before the second plane hit tower 2. His remains were never found in the devastating collapse of the towers.
Rick Rescorla had saved about 2,700 lives with his evacuation plan.