We’d like to think they’re invincible, but America’s power stations, water supplies, financial systems, and military communications are all vulnerable to attack. And the most pressing threat isn’t from bombs or other physical dangers—it’s from computer hacking. What can be done to protect our infrastructure and prevent a devastating digital assault? To find out, this CNBC Original documentary goes to the front lines of the war on cybercrime and cyberterrorism. Overviewing the tools, personnel, and agencies which the U.S. government has put in place to patrol the high-tech landscape, the program identifies some of the issues these entities must address—like the fact that computer components are often made in countries potentially hostile to America. Another chilling reality: large-scale attacks against governments are not only likely; they have already occurred, as security breaches in Estonia and Iran make clear. Not available in French-speaking Canada. (44 minutes)