The WWII German U boat 505. The submarine was captured and brought to Chicago. The story of it's transportation to Chicago is as interesting as the story of the submarine itself.
Quarters in any submarine are very tight, and we decided to opt out of the tour. There are exhibits on the side that depict life on the boat.
The submarine is part of the museum of science and industry, for more information see their website
http://msichicago.org/whats-here/exhibits/u-505/