S.C. Code Ann. § 25-9-120: Immunity of persons owning property used for civil defense.

No person owning or controlling property who voluntarily and without compensation permits such property to be used as a public shelter for civil defense purposes shall be civilly liable for the injury or death of any person who may be injured or killed on such premises, or for the loss of or damage to the property of any person on such premises, during any time such premises are actually being used as a public shelter.