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The sonar went down and day after day no triple 7. well, now, we're beginning to get some idea of why. and it is surprising. details from renee marsh. >> reporter: it was the most promising lead and now we know it's false. new information the u.s. navy has concluded these four underwater signals were not from the missing plane's black boxes. >> from the u.s. navy standpoint, these sounds were most likely not from the black boxes. >> yes, i would have to say at this point based on all of the imagery data that we have collected and looked at, if that black box were nearby we would have picked it...

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...

Boxes. >> yes, i'd have to say at this point, 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. >> reporter: when detected in april, the pings boosted confidence the plane would be found. >> the full signals previously acquired taken together constitute the most promising lead. >> reporter: but now the navy says the sounds doh could have been from the search ships itself or other electronics. >> we may very well have been in the wrong place. but at the end of 30 days, there was nothing else to listen for. >> reporter: aft...