students took over. a panicked moment captured in argo. >> burn it all. >> reporter: where the embassy including the cia would do its most sensitive, and back home a teletype machine, ancient fax machine. this looks like coding equipment. all of it now the prized possessions of the iranian revolutionary guard. equally prized is more modern propaganda. a tacky mural tells a familiar middle eastern con speerspiracy claiming the u.s. is behind 9/11. why would we do that to our own people? >> translator: to make them feel in danger so they could attack other countries. >> reporter: any optimism about the new diplomacy between iran and the u.s. could you ever imagine american diplomats returning to the embassy and opening the embassy again?