We are the Call Before You Dig Center for SC. 811: Know whats below, Call before you dig! NOTE: SC811 does NOT mark lines. South Carolina 811: Your essential first step for safe digging since 1978. We coordinate with utility companies to protect underground infrastructure across the state. Always contact 811 before you dig - it's free, it's easy, and it's the law! To be the innovative communication resource for damage prevention of underground infrastructure, dedicated to the education, success, and safety of our stakeholders and the public.