searching. the bluefin-21 s mission is not now over. that search has turned up nothing. the australians confirming overnight that they do not believe that mh-370 s final resting place is in that several hundred square mile area where the bluefin has been scouring and searching for closure for these families. at the same time, the u.s. navy telling our very own renay marsh that in fact the pings detected in early april may not have even come from an airplane black box but perhaps could have been caused by the search ships in that area. it s a stunning about face and certainly a big change from the cautious optimism that you and i saw in western australian when searchers at one point thought they might just be days from finding this wreckage. now we know they have to wait another two months before private companies come into this area and begin the new massive phase of this search that could take up to a year. they re going to scour 60,000 square miles, kate. meanwhile, all these familie
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because what has been lain against me are not normal charges. the espionage act provides anyone accused of it of no chance to make a public defense. you are not allowed to argue based on all the evidence in your favor, because that evidence may be classified, even if it s exculpatory. and so, when people say, why don t you go home and face the music, i say, you have to understand that the music is not an open court and a fair trial. secretary of state john kerry disputes that. he calls snowden a coward. he says real patriots face the consequences of their actions. kerry invited snowden to come home any time he wanted. of course, he would face a trial. breaking news this morning from australia, where officials are now confirming a six-week-long underwater search for flight 370 has turned up nothing. the bluefin-21 had been scouring the floor of the indian ocean covering more than 300 square miles looking for any sign of the jet months after it
detected it. reporter: when detected, it boosted confidence that the plane would be found. the four sounds taken together make up the most promising lead. but now the navy says the sounds could have been from the search ship itself or other electronics. we may have very well been at the wrong place, but again at the end of 30 days there was nowhere else to search for. after searching the ocean floor, the bluefin 21 s mission is over. there will be new private companies taking over. meanwhile, a new potential lead. cnn has learned a sound that could have been the plane crashing was detected by underwater microphones. our analysis is designed to do the exact nuclear of that sound. yes, we have a view to finding if there was any evidence on impact of the malaysian aircraft.
based on all of the imagery data we ve collected and looked at, if that black box were nearby, we would have picked it up. when detected in april, the pings boosted confidence the plane would be found. the four signals previously acquired taken together constitute the most promising lead. reporter: now the navy says the sounds could have been from the search ship itself or other electronics. we may very well have been in the wrong place. again, at the end of 30 days, there was nothing else to listen for. reporter: after searching 329 square miles of ocean floor, the bluefin-21 s mission is over. the search continues in august when private companies take over. meantime, a new potential lead. cnn has learned a sound that could have been the plane crashing was detected by underwater microphones. our analysis is designed to monitor earthquakes. looking with the data