(Editor's Note: In the video, I erroneously stated that the hedgehogs detonated at a predetermined depth. They actually were detonated on contact via a contact fuse. Apologies for the error.)

It's not very often that you get to go inside a German Uboat from WWII, but we get to do just that at the Museum of Science & Industry in Chicago, Illinois. All kinds of interesting stuff to learn in this one!

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