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THE GREAT TUNNEL AND THE MISTAKE.
FOR several weeks, some ten or fifteen of the most able-bodied of the prisoners had been nightly at work; and the great tunnel, the [largest] ever projected by men for their escape from prison, was thought to be finished, with the exception of the tapping outside of the prison wall.
The digging of a tunnel is not an easy job, and, consequently, is of slow progress.

The Andersonville prisoners had to dig ten feet down into the earth, after cutting through the floor, and then went a distance of fifty feet to get beyond the wall.

The digging was done in the following way: As soon as the operator was below the surface, and had a place large enough to admit the body, he laid down upon his face, at full length, and with his knife, spoon, piece of earthenware, or old iron, dug away with all his energies, throwing the dirt behind him, which was gathered up by a confederate, carried off, and hi.

This mode of operating was carried on night after night, and the flooring replaced during the day, to prevent suspicion.