Survivors become separated when they are enveloped by a toxic dust cloud. We follow their quest to be reunited with their loved ones.

A group of firefighters were inside the North Tower when it collapsed, but miraculously survived. It's a race against time to find and rescue them.

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.