After hearing reports of the terrorist attacks on the World Trade Center on September 11, 2001, two former marines were among the heroes who answered a call to duty. Follow Staff Sergeant Dave Karnes and Sergeant Jason Thomas on their mission to rescue those trapped in the debris. Based on the true story and in honor of the two marines who risked everything to help at Ground Zero. Additional material provides an overview of the events of the day and other stories of heroes at Ground Zero.