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Episode Information

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Episode description: Examine the impenetrable submarine pens the Nazis built to protect U-boats from Allied attacks. Such was their size and strength that these pens survive today, a testament to their engineering.

Rating: [TV-PG] (Parental Guidance Suggested)

Series Information: Nazi Mega Weapons

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First aired: Wednesday, July 24, 2013 (excluding any air dates prior to June 1999)

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