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At the outbreak of war, they were the pride of the German navy: the submarines.
But soon the "gray wolves of the seas" increasingly went from being the hunter to the hunted.
In the first 18 months of the war, German U-boats sank more than 1,000 British ships.
Even Winston Churchill considered this weapon to be the greatest threat to the Empire.
But then the Allies made a groundbreaking technological discovery that changed everything.
The film depicts the dramatic events of the years 1939 to 1943 and mercilessly reveals how the battle in the Atlantic turned into a disaster for the German submarine weapon after initial successes.
39,000 submariners fought on 863 boats - more than 27,000 never returned.
