Underwater archaeologists search for the wreck of the USS Planter, a Civil War vessel seized by Freedom Seekers to escape the Confederacy; in Canada, experts use high tech to uncover how Freedom Seekers lived once they made it to their new homeland.

Archaeologists uncover evidence of a Freedom Seeker community in the swampy marshlands between Virginia and North Carolina; in Maryland, experts investigate artifacts that may confirm the location of Harriet Tubman's childhood home.

Archaeologists unearth the lost community of Quindaro, Kansas, a long-forgotten abolitionist town that shielded Freedom Seekers from bounty hunters. In Alton and Miller's Grove, Illinois, experts use high-tech tools to explore secret underground tunnels.

Retracing the steps of Freedom Seekers escaping on the Underground Railroad, archaeologists use high tech to explore Negro Fort, a Florida fort nearly erased from history. Routes through Texas to Mexico are also explored.