 Mike Gallagher. Call 811 before you start any project that requires digging. It doesn't matter if you're installing a mailbox or digging with heavy machinery. Always call or click before you dig. Calling to have your underground lines marked is a free service and can help prevent you from damaging a utility line, which could result in injury or costly fines. It may even save your life. Simply call 811 or click SC811.com. Sponsored by South Carolina 811.