drone that's been searching for wreckage for weeks has completed its mission. australia says they are confident that it's in the southern indian ocean, they are now making a stunning admission about what was their most promising lead. rene marsh is here. there seems to be a consensus about whether those pings came from flight 370. >> right. those pings, so to speak, are in question. of course, the headline today is flight 370 isn't where they thought it was. also tonight, we have more from our exclusive interview from a navy official who told us that the pings were not from the plane's black boxes. the navy quickly tried to walk back those comments calling it premature and speculative. premature perhaps. but this morning they called it accurate. it's now official, australia telling the world that flight 370 is not in the area where pings were detected.