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The Great Dismal Swamp is an uninhabitable wasteland covering parts of Virginia and North Carolina. For hundreds of years, there have always been claims that runaway slaves found refuge in the Great Dismal Swamp.

Historical archaeologists Daniel Sayers and Becca Peixotto are convinced that the evidence they are looking for is still hidden somewhere. Their team finally uncovers the truth behind these old rumors, finding proof that an entire thriving city of escaped slaves existed in the swamp.