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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? >> its 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 hac...

They steal an employees 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 irans 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. >> amtraks 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 didnt maintain our infrastructure. >> every day,...

We appreciate it. still to come, no one likes a commute under normal conditions, but thanks to fireballs like this one, thousands of people may be delayed for a long time in one major american city and just in time for tourist season. and how do you democratic candidates want to power your home? natural gas, solar or coal? we will look at the energy plans after the break.

Have specifics on how she would do that and they say she will take time. >> nevertheless, either one of the proposals talking about she wants to have every home in america powered by clean energy in the next four years. that aint cheap. >> certainly not, but it is doable. in laymans terms, 33% energy in the country, right now we are around 15 at best. its a huge change. it costs a lot of money, but it is achievable. >> $7 million, somewhere in there. as you look at both of these, have either lea...

Phone. >> can i have your attention. >> reporter: even the energy department lost power, so did the white house, though the back upgenerator kicked right in. >> i was with the president and he did not know. >> reporter: oprah winfrey just kept talking. >> no doubt about it. >> reporter: but some of the most popular museums were evacuated. including the smithsonian air and space. >> theres a possibility it might have some terrorist activity. >> it was scary. >> reporter: the university of marylan...

Every year around this time nationally price goes up because we switch over to summer blend gas. summer fuel gasoline is more expensive to produce. >> reporter: and refineries go through a maintenance cycle during the switchover. that means production is lower. an explosion at the exxonmobil refinery in torrance california last week, made things worse. and a strike by steelworkers at 12 refineries across the country is impacting 20% of oil production. nationwide gas prices have been dropping sin...

Because its my hometown. its a rewarding feeling. just days into his very first week in office new secretary of defense ash carter traveled overnight to afghanistan where hes meeting with u.s. troops and talking with afghan leaders about how to ensure lasting stability as those troops withdraw from the country. in a joint press conference, secretary carter said one possibility is to extend the