It not only serviced the German submarine fleet, but was also the only dry dock on the Atlantic capable of housing the German battleship Tirpitz, one of two Bismarck-class ships built for the German Kriegsmarine during World War II.
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The nearby region has long been an area of contact and conflict between Breton culture and that of the neighbouring Loire valley, and consequently is rich with historic places, castles (Nantes castle), walled cities (Guerande), not to mention 19th century seaside resorts, such as Quiberon, and many typical Breton fishing villages (Pornichet).