Which innovative military product, introduced during World War II, revolutionized naval warfare by allowing ships to detect submarines underwater at greater distances than ever before?

Throughout history, military technology has driven some of the most significant product innovations, often later adapted for civilian use. From the development of reliable firearms to modern precision-guided munitions, military product innovation has shaped battlefield tactics and strategies. This poll tests your knowledge about a revolutionary military product innovation that changed the course of warfare and represented a major advancement in military technology during a critical historical period.

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ASDIC/Sonar (Active Sound Navigation and Ranging)
The Norden bombsight
The Enigma machine decoder
The Liberty ship prefabrication system