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Hell Below:

The Greatest Threat to Allied Merchant Ships During WWII

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»Atlantic Showdown

The Greatest Threat to Allied Merchant Ships During WWII

Short | 02:34

For Admiral Karl Donitz, disrupting Allied merchant shipping from North America to Europe required a force of 300 submarines. By January 1943, he had the number of U-boats he needed.

More About This episode

A Nazi U-boat heading back for repairs unintentionally cruises right into the middle of a large Allied convoy on March 16, 1943. It is a lucky accident that sets the stage for the largest convoy battle of World War II. Relive this momentous chapter in the war for the Atlantic, an intense game of chess pitting Admiral Karl Donitz's wolf pack against a battered British Navy. It's a three-day showdown with unparalleled violence and unexpected outcomes that will turn the tide of the war.

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