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Anti-Submarine Warfare (ASW) techniques grew out of necessity during WWII. In the early days of the Battle of the Atlantic, German U-boats had a field day sinking supply ships bound for Britain. In time, as the U.S. joined the war, the escorted ship convoy system, along with aerial reconnaissance and later long-range bomber cover, eventually spelled the end of the U-boat threat. By the end of the war, German U-boats had suffered losses of 70% of boats and crew.

Allied warships also began carrying the first early forms of Sonar and Radar, which significantly improved submarine detection.

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Q: What were used to prevent submarine attacks on ships?
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