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Back in 2004 when The Citadel was getting ready to renovate the Johnson Hagood Stadium, they came across some 341 graves. The school got the OK to unearth those remains, which have now been examined, reburied, and will soon have a plaque unveiled to honor them.
The Post and Courier says this about the old graves:
Historians think that in the 19th and early 20th centuries, the area had multiple uses, including as a Seaman's Burial Ground, a cemetery for the Harriett Pinckney Home for Widows and Orphans and as a resting place for the city's indigent population, some of whom were sailors.
A couple of stories are out there about this, put The Post and Courier generally has the better.