In Lara Deep Sea Discharge project, the coastal connection of Q1200mm YYPE pipeline was disconnected and redirected, after identification of failures in the submerged part, about 1000 m³ excavation was made on the 200m twisted line. It was brought to the surface with vessels and other equipment and floated to the coastline. After completion of repair works at the coast, it was carried to the sea and located in the normal line route under the water. After completion of all these stages, the barge and CARDINAL marine signal buoy were produced and installed according to IALA (International Association of Marine Aids to Navigation and Lighthouse Authorities) standards for protection of Lara Deep Sea Discharge line. Necessary installations were made for online monitoring with satellite tracking system of each buoy in Hurma and Lara Deep Sea Discharge lines.