The Australian navy's Ocean Shield, which is carrying high-tech sound detectors from the US Navy, picked up two separate signals inside a patch of the Indian Ocean that search crews have been crisscrossing for weeks. Search Coordinator Angus Houston reported Monday that the first signal lasted two hours and 20 minutes before it was lost. The ship then turned around and picked up a signal again - this time recording two distinct "pinger returns" that lasted 13 minutes, he said. These signals were picked up west of the area where the Chinese Haixun 01 detected shorter pulses Saturday.

"Significantly, this would be consistent with transmissions from both the flight data recorder and the cockpit voice recorder," Houston said and “the most promising lead yet” in the month-long search for the Malaysian airliner missing without trace since March 8 with 239 people aboard. He said the position of the noise needs to be further refined, and then an underwater autonomous vehicle will be sent in to investigate. But this could take days.