The French nuclear-powered submarine Emeraude is seen in this undated file photo released June 10, 2009 by the French Defence Ministry
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The French nuclear-powered submarine Emeraude is seen in this undated file photo released June 10, 2009 by the French Defence Ministry. The Emeraude, with advanced sonar equipment was due to begin searching on Wednesday for the "black box" flight recorders of the Air France airliner which crashed into the Atlantic Ocean last week, the French military said. (Reuters Photo)