Sept. 9, 2025 ~ Detroit’s grit runs deeper than its streets—literally. In this episode of Hidden in Plain Sight, Dr. Robert Livernois uncovers the Detroit Salt Mines: a sprawling underground network formed 400 million years ago and still active today. From donkeys living underground to tunnels stretching beneath multiple cities, listen to learn how these hidden mines are a story of geology, industry, and resilience. Hosted by Simplecast, an AdsWizz company. See https://pcm.adswizz.com

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