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(CNN) – As an underwater drone keeps going up and back down, so do hopes that evidence of Missing Malaysia Airlines flight MH370 may be found.
A metal object that washed ashore in Western Australia and sparked the curiosity of investigators Wednesday turned out to be unrelated.
And while the Bluefin-21 plunged into the Indian Ocean for its 12th mission Thursday, no one was certain the drone would find anything new.
CNN's Pamlea Brown reports.