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>> there could be guidance from the plane itself. if it's underwater, beacons attached to the voice recorders are still transmitting acoustic pulses or "pings." however -- >> at the end of 30 days, the batteries will be at the end of their design life. >> another form of guidance is acars. >> it's a common piece of communication equipments on all planes. it's that system that sends down a lot of information about how the engines are performing and how other systems are disablged.

If it's underwater, beacons attached to the voice recorders are still transmitting acoustic pulses or "pings." however -- >> at the end of 30 days, the batteries will be at the end of their design life. >> another form of guidance is acars. >> it's a common piece of communication equipments on all planes. it's that system that sends down a lot of information about how the engines are performing and how other systems are disablged. >> periodic pings are picked up allowing triangulation of positions in an area of

Office in late 2006. secretary clinton spoke about the problem a short time ago. >> we are working in our two governments together, to solve the problem posed by the criminal cartels. that stalk the streets of your cities and ours. that kill and injure innocent people. and spread a reign of terror and imitation. >> reporter: the military is providing intelligence and surveillance support, communication equipments and helicopters to help the mexican military take fight to the traffickers. >> greta: thank you. in china, executives of the internet giant google briefed employees on what lines of t...

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