Furkan Yaren, Ilhan Suha Tatligul and Bahadir Yesilalan had flown home to Turkey from Gabon.
Foreign Minister Mevlut Cavusoglu tells reporters strict measures are being taken to avoid such incidents in future after Turkish sailors were kidnapped by pirates in Gulf of Guinea.
Crimea's rights ombudswoman says three sailors will be held until January 25 over accusations of crossing into Russian territory illegally. Russia holds over 20 sailors after seizing three of Kiev's ships off the coast of Crimea.
Unions are seeking a five percent pay rise after an eight-year pay freeze under Greece's international bailout programme, which ended last month.
Japanese media says the bodies were inside flooded compartments. At least three people were evacuated to the US Naval Hospital in Yokosuka in Japan, including the ship's commanding officer.
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