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Control to subways and traffic lights, cell phone, computers, water, and food supplies. cnn was given rare access to a government test facility in idaho falls where a team of cyberexperts, led by marty edwards, is busy identifying hackers and trying to stop them. is it difficult for some sort of a cyberattacker to take down a power grid? >> it's much more simple than we would like it to be. [ siren ] >> reporter: to show us just how simple it is, the cyberteam re-created the ukraine attack. a hacker using a common e-mail phishing scam steals an employee's credentials, takes full control of the...

They steal an employee's credentials and shuts it down sdplp in the ukraine, power was knocked out to several substations. >> correct. >> can that happen here. >> all of these systems are run -- it is the same code dhs recently midded is in hundreds and thousands of u.s. computer systems that control critical infrastructure. the code has been linked to russia. >> 75% to 80% is owned and operated by private sector companies. dhs says some companies have failed to take even basic cyber

Substations serving iran's power grid. >> we have now had a cyberattack that was disruptive. a power outage impacts everything. from air traffic control to sub ways traffic lights, water, and food supplies. cnn was given rare access to a government test facility in idaho falls. >> is it difficult for a cyber attacker to take down a power grid. >> it is much more simple than we would like it to be. >> to show us how simple, they recreated the ukraine attack.

Like -- this is not a scenario for a movie. hackers penetrating our systems has already happened. hacking is no longer just about computers a data. it is a very real risk of physical damage. >> yes, and russian malware is in hundreds and shows of computers. it is not only real, but it has happened. >> so what happens is one of these large breakers, several of the large breakers were operated remotely by the attacker. >> three attacks, 20 minutes apart against three electrical

Concrete is cracked and crumbling. of superstorm sandy flooded the tunnel, the situation became your jenlt. >> the salt is eating away at concrete. it is eating away at the rails. it is eating away at the cables that go through here for power. >> amtrak's ceo, joe boardman, calls it one of the most glaring examples of aging railway infrastructure in the united states. >> this is the busiest corridor in the western hemisphere. we got here because we didn't maintain our infrastructure. >> every day, about 2:30,000 riders pass through it. the power cables are 80 years old causing shutdowns and ma...