Ground penetrating radar being used to find unmarked graves of African Americans who escaped slavery in the U.S

I only discovered today that this has been going on just down the street from me in Niagara on the Lake. James Russell used ground penetrating radar to detect 28 potential buried people and 19 headstones at the site of Niagara Baptist Church (closed 1878). "Respecting the living has a lot to do with respecting the dead as well," he said. "These people have to be given names and faces."