S.C. Code Ann. § 62-3-1307: Publication as to nonresidents and parties with unknown residences.

If there is any party who resides beyond the limits of this State or whose residence is unknown and who does not consent in writing to the sale, the court may authorize publication of the summons as provided by this Code and if such party does not appear and show sufficient cause within the time named in the summons the court shall enter of record his consent as confessed and proceed with the sale.