Almost 70 years after its sinking, the powerful headlights of two high-tech research submersibles illuminate the silhouette of the biggest German battleship ever. The pride of the German Kriegsmarine: Bismarck. In 1941 the Bismarck was sent out to raid and destroy allied supply convoys in the North Atlantic. With resources vital to their nation under threat, the British fleet went after this supposedly unsinkable ship. But who actually sank the steel giant? This high-end, CGI-intensive documentary retraces the first and final voyage of Hitler's dreaded weapon: the Bismarck. The Bismarck was a German battleship and one of the most famous warships of the Second World War. The lead ship of her class, named after the 19th century German Chancellor Otto von Bismarck, Bismarck displaced more than 50,000 tonnes fully loaded and was the largest warship then commissioned. This documentary is telling the story with the last survivors and visits the mangled wreck after sixty years.