Following the first firefighters on the scene and their race against time to rescue trapped civilians.
Survivors search for loved ones after becoming separated when they are enveloped by a toxic dust cloud.
It is a race against time to find and rescue a group of firefighters who were inside the North Tower when it collapsed.
At Ground Zero, two ex-marines and an ex-paramedic join forces to search for survivors and pull off one of the most miraculous rescues of the day.