Built alongside the Titanic and Olympic at Belfast's Harland and Wolff shipyard, the Britannic was converted into a hospital ship during World War I and sank near Kea Island in November 1916 after striking a German mine, killing 30 of the 1,065 people on board.
The recovered objects, now transferred to laboratories in Athens, will be permanently displayed in the under-construction Underwater Antiquities Museum in Piraeus.