The three were amongst 11 men who were aboard the Turkish vessel and another, Belize-registered, ship when they collided in storm conditions about a mile and a half (two kilometres) off the port of Ravenna on Italy's Adriatic coast.
The accident occurred as Italy was attempting to coordinate the evacuation of hundreds of passengers and crew from a stricken ferry off the Greek island of Corfu, in the south of the Adriatic.
The ferry had been destined for the Italian port of Ancona when a fire broke out on board.