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We will never forget September 11, 2001 - a day of unimaginable tragedy, forever altering history and our place in the world. Now, the National Geographic Channel presents "Inside 9/11," a comprehensive and compelling perspective on that tragic day, which goes beyond what's been widely reported to reveal a clearer picture of events.

With meticulous attention to detail and first hand storytelling, "Inside 9/11" traces the time line that led up to the deadly attacks and deconstructs the fateful day, tracking the movements of all four terrorist teams and patching together the ad hoc response of government.