As US troops approached a Nazi prison camp, they could hear agonized wailing. The stench of rotting flesh filled their nostrils. Moments later they discovered a pile of smoldering corpses, alongside emaciated survivors. Next to the concentration camp they found something else: tunnels filled with tools — and partially assembled rockets. The soldiers had hit upon the evil heart of the V2 manufacturing program: enslaved laborers, imprisoned underground. And the rocket program's director? Wernher von Braun had already fled. He now had just one concern: persuading the Americans to let him switch sides… For a full list of sources, see the show notes at timharford.com. Do you have a question for Tim? Send it to [email protected] and we'll do our best to answer it in a Q&A episode.See omnystudio.com/listener for privacy information.