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Case, and many hospitals don't pay? >> they are going to lose their data. it is the computer that is simply the hard drive is going to be locked up, and they won't have access it to, and they have to reinstall a operating system, and that is why it is just utterly critical to always back up your information and put it on a separate system. >> what do we know about what the program is in general intended to do? >> well, these ransomware p programs are simply made to make their victims feel so frustrated that they are willing to go out and buy bit coin and pay the ransom. the perp tetrators are ...

Hillary clinton, and he joins us from las vegas. your interview with hillary clinton has led the newscast because of the dynamic of the conversation. what do you think is a big headline coming from your he can change with her -- coming from your -- coming from your exchange with her. >> i asked her a direct, plain, fair question which is did you wipe the server. number one, someone tried to wipe the server, number one, and number two, the f.b.i. believes they have the forensics to get the data back. the fact that she couldn't answer directly whether she did or not was stunning number one. numb...

$300. and the police were forceed to pay the ransome to get the data back. the computers were taken over by what is called ransome ware. and the fbi traced it to a swiss bank account but could not find the hackers. experts say the best way to avoid the ransome wear don't down load suspicious attachments. >> and the hunt continues for four more. and it is our top story as we go across america. >> pennsylvania, you can see the group get out of the van and attack a homeless man in the philadelphia gas station. six people armed with a hammer and mace and a piece of wood beat him and left him criti...

It's very challenging. >> let's go inside. i want to take a look at how this looklooks. once the sonar is down there it has got to take some data back. >> the idea is to move the sensor back and forth in a regular grid pattern. we're moving along now. you see that we did one line previously. as you do you're building up a map of what's on the sea floor. we're seeing in realtime the auv. they only see it at the end of their mission. >> they are sort of flying blindly? >> in a way, yes. they will make their mission planning parameters based on general information. it may change the way they sear...

Checks. if any of those things go off, you want to get the vehicle back. it could be going way down to the floor of the ocean and you don't want it to drift on its own. >> they do stay in communication with it. the boat sending it down will communicate with it and try to get it back if there is a problem. >> yes, that's part of the vehicle's own logic. >> so the vehicle does some of it on its own. part of the issue too is just the depth. since they don't know really what they're dealing with, that's part of the problem of getting that data back. >> stephanie elam, james, thank you, we apprecia...