Which of these military product innovations was specifically developed during WWII and dramatically changed naval warfare by allowing submarines to remain submerged for extended combat operations?

Throughout history, military product development has dramatically shaped the outcome of conflicts and transformed warfare strategies. From ancient catapults to modern stealth technology, military innovations represent some of humanity's most significant engineering achievements. This poll tests your knowledge of a crucial military product development that revolutionized combat tactics during a critical historical period. Can you identify which development truly changed the course of military history?

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The snorkel system (Schnorchel), allowing submarines to run diesel engines while submerged
Nuclear propulsion systems for submarines
The hydrophone passive sonar detection system
The ASDIC/SONAR active detection system