countless satellite images stored long betore the compound was ever constructed. >> in this case, because let's face it, we did not suspect this facility or know why this was was being built when it was being built but our ability to have that library coverage allows us to go back and essentially rebuild over a period of time. >> rebuilding a scale model accurate to the centimeter. >> the taking down of osama bin laden was the classic example of successful use of intelligence. >> announcer: james clapper coordinates all the efforts of all american intelligence agencies. >> that was a huge moment for me and a lot of us in the intelligence community, particularly those of us who lived through 9/11, it was closure. it really was. >> since 9/11, threats to the u.s. have grown more