There are new concerns about whether the signals detected in the Indian Ocean a month ago were from Malaysia Airlines Flight 370's black boxes.
A source tells CNN that U.S. Navy officials are now calling on experts to re-analyze the pinger data.
There were four sets of pings detected near the beginning of April, and the Wall Street Journal reports that searchers are "increasingly suspect" that the last two did not come from Flight 370.
The Ocean Shield is on it's way back to the area where those pings were detected to resume the search The Bluefin-21 is expected to start its next dive within hours – its first mission in over a week.
Rene Marsh is OutFront with the details.