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So flight 370 disappeared on march 8th. it has been four weeks to the day since that disappearance. >> and the global hunt for clues. jut one shred of physical evidence at this point is in full force this morning. both on the surface of the indian ocean and deep below it. >> cnn's tom foreman has more on the latest on the state of the technology being used in this water search. tom, good morning. >> hey, victor, hey, christi. right now, all of the hopes of families and searchers are coming down to two thing, an educated guess and technology. technology in the form of sonar. let's talk about th...

It basically tows behind a ship up here and listens to see if it can hear the black box, data recorders pinging on the bottom of the ocean, to see if they can find them. you have to get pretty close, within a couple of miles and this is a slow laborious process. the ship up top is traveling only four or five miles an hour at best. if you're standing on the deck, you'd have a light breeze in your face. that's the passive sonar. it's listening for anything it can find. beyond that there's also some active sonar at work here. let's go underwater and talk a little bit about what that involves. ess...

I felt you near me. i appreciate you. >> reporter: thank you. a mother with no support system at home crushed by the burden of waiting to find out what happened to her first born son. sara sidner, cnn, kuala lumpur. leaders of the search operation openly acknowledge they're making an educated guess about the possible crash site, and that's why the target area has changed a number of times. our tom foreman is looking into this part of the story for us. he's joining us from our virtual studio. tom? >> yeah, wolf, really the hopes for those families, for finally getting an answer to where in th...

Military, u.s. defense secretary chuck hagel received a request from his malaysian counter part during a 30-minute phone call this morning to send high tech surveillance hydro phones, microphones that work under water a form of passive sonar. the problem, according to u.s. defense officials is those hydro phones need a narrow field to search. the u.s. military has already spent $2.5 million on the search and budgeted just $4 million total. the p-8 poseidon, that state of the art surveillance plane we're told will not be flying for the next 24 hours. the pilots and crew needs to rest and the pl...

Secretary chuck hagel received a request from his malaysian counter part during a 30-minute phone call this morning to send high tech surveillance hydro phones, microphones that work under water a form of passive sonar. the problem, according to u.s. defense officials is those hydro phones need a narrow field to search. the u.s. military has already spent $2.5 million on the search and budgeted just $4 million total. the p-8 poseidon, that state of the art surveillance plane we're told will not be flying for the next 24 hours. the pilots and crew needs to rest and the plane must underguru teen...