In Enemy Hands

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Kapitän Jonas Herdt: [narrating] At the outbreak of World War II, Germany increased its U-boat production by 1,000%, mass-producing 17 new U-boats a month. Hitler knew the key to winning the war in Europe was to control the Atlantic. And control it he would. By 1942, German U-boats, working in groups called wolf packs, sunk over 1,000 Allied ships. Their success gave Germany a decisive advantage. They were winning the war. And if this trend continued, all of Europe would fall.