The Twin Towers of the World Trade Center were designed to be impervious to an attack by airplane. But the events of September 11 revealed a horrific flaw in the plans. Find out how and why the two towers, once thought to be indestructible, were reduced to rubble. CGI Graphics and eye-witness accounts unravel the split-second events of the 11th of September in visual detail, explaining the answers to the questions that haunt the American public