Using Barclay's and Norma Robertson's research, we can assume that approx 606 feet (one Greek furlong) from the SW corner of the Temple Mount, and approx 40 feet below the current ground level of the Mount, one would find three, now blocked up, arched entryways in the south wall.
Utilizing Barclay's and Norma Robertson's research, we can infer that roughly 606 feet (one Greek furlong) from the SW corner of the Temple Mount, approximately 40 feet below the current ground level of the Mount, would yield three, now sealed, arched passageways in the south wall.