CNN Anderson Cooper 360 May 29, 2014 00:15:00
More breaking news tonight, day after day, for weeks we watched as the hunt for malaysian airlines flight 370 was searched for, and pings were detected, pings believed at the time to be from the cockpit voice recorders. 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 is 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 l...
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