The French agency investigating last week's crash of a Yemenia Airways flight to the Comoros says a submarine taking part in the search has picked up signals from the aircraft's two black boxes. The accident investigating agency BEA said the signals were picked up Sunday morning during a submarine search for the black boxes, which are critical to understanding the cause of Tuesday's crash off the Comoros coast. A 12-year-old girl is the only survivor of the crash that killed 152 people on the flight from Paris to Moroni, the capital of the Comoros. BEA's one-line statement gave no indication of when the flight data record and the cockpit voice recorder in the black boxes might be recovered, The Associated Press reported.