Ira introduces this week's story.

In 1946, a man named David Boder started to investigate the Holocaust before it was known as the Holocaust. He dragged a primitive recording device around Europe and gathered the first recorded testimonials of concentration camp survivors.

Host Ira Glass joins a group of tourists to walk through the captured German submarine that's on permanent display at Chicago's Museum of Science and Industry. He notes that the Museum chooses to underplay the murderous Nazi origins of the boat.