During World War II,the effectiveness of German U-boats and underwater mines was greatly reduced by the development of

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All of the listed advancements contributed to the reduction of the effectiveness of German U-boats and underwater mines. Acoustic countermeasures helped to detect and locate submarines, while sonar enabled Allied ships to detect U-boats and avoid their attacks. Centimetric radar improved the accuracy of detecting U-boats and advanced cavity magnetron valves improved the capabilities of radar technology.

During World War II,the Effectiveness of German U-Boats and Underwater