A French naval ship specialized in underwater searches will help search for the black box flight recorders of the EgyptAir flight that crashed in the Mediterranean last week, killing all 66 aboard.

The French air accident investigation agency, the BEA, said in a statement the Laplace ship left Thursday from Corsica for the zone of the crash, with two BEA investigators aboard.

The Laplace is equipped with three detectors made by the Alseamar company designed to detect and localize signals from the flight recorders, believed about 3,000 meters (3,280 yards) underwater.

France may also send an unmanned submarine and deep-sea retrieval equipment.

The BEA is involved in the search because the crashed plane was an Airbus, manufactured in France. The cause of the crash, on a Paris-Cairo flight, is unclear.