S.C. Code Ann. § 15-67-40

In any action brought to determine adverse claims to real property within this State the plaintiff may insert in the title thereof, in addition to the names of such persons as are known or appear of record to have some right, title, interest, estate or lien in or on the real property in controversy, the following: "Also all other persons unknown, claiming any right, title, estate, interest in or lien upon the real estate described in the complaint herein." Service of the summons may be had upon all such unknown persons defendant by publication in the same manner as against nonresident defendants, upon the filing of an affidavit of the plaintiff, his agent or attorney, stating the existence of a cause of action to try adverse claims within this State. The plaintiff shall before commencement of such publication file with the clerk of the court a notice of the pendency of the action, a copy of which shall be published in the same newspaper with and immediately following the summons.