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U.S. Navy LT JG Curtis Calabrese takes notes on board of a U.S. Navy Lockheed P-3C Orion patrol aircraft from Sigonella, Sicily, Sunday, May 22, 2016, searching the area in the Mediterranean Sea where the Egyptair flight 804 en route from Paris to Cairo went missing on May 19. Search crews found floating human remains, luggage and seats from the doomed EgyptAir jetliner Friday but face a potentially more complex task in locating bigger pieces of wreckage and the black boxes vital to determining why the plane plunged into the Mediterranean. (AP Photo/Salvatore Cavalli)
U.S. Navy LT JG Curtis Calabrese takes notes on board of a U.S. Navy Lockheed P-3C Orion patrol aircraft from Sigonella, Sicily, Sunday, May 22, 2016, searching the area in the Mediterranean Sea where the Egyptair flight 804 en route from Paris to Cairo went missing on May 19. Search crews found floating human remains, luggage and seats from the doomed EgyptAir jetliner Friday but face a potentially more complex task in locating bigger pieces of wreckage and the black boxes vital to determining why the plane plunged into the Mediterranean. (AP Photo/Salvatore Cavalli)

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    Possible underwater signal from EgyptAir 804 detected

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Possible underwater signal from EgyptAir 804 detected

A French naval vessel has detected an underwater signal that could have originated from the flight data recorder of crashed EgyptAir Flight 804. CNN's Ian Lee has more.

Possible underwater signal from EgyptAir 804 detected

A French naval vessel has detected an underwater signal that could have originated from the flight data recorder of crashed EgyptAir Flight 804. CNN's Ian Lee has more.