This Massive Cold War Spy Satellite Was Hidden from the World Until NowSam Biddle9/18/11 4:25pm981EditPromoteDismissUndismissHideGo to permalink The HEXAGON satellite spied on America's Cold War foes for over a decade, taking extremely detailed (film!) photographs from space. It was 60 feet long—bigger than a bus. And the public never, ever saw it. We did.