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YouTubeIT'S HISTORY
Why Detroit has 100 Miles of Secret Tunnels Below the City
Deep beneath the bustling streets of Detroit lies a subterranean world that many residents don't even know exists. For over a century, a massive network of salt mines has expanded into a 100-mile labyrinth, creating what many call a Secret City 1,000 feet below the surface. In this documentary, we explore the industrial history of the Detroit ...
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