What technological development ultimately led Hitler to withdraw the infamous U-boats from the North Atlantic?

Name: What technological development ultimately led Hitler to withdraw the infamous U-boats from the North Atlantic?
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Question

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The technological development that led Hitler to withdraw the U-boats was the invention of the radar detector. The Allies were able to detect and track the U-boats with radar, making their attacks less effective and more risky for the German navy.

What Technological Development Ultimately Led Hitler to Withdraw the Infamous