Within the scope of the pipe fabrication and assembly works of the DP-1 Off-Shore natural gas platform in the North Marmara Underground Natural Gas Storage Facility Phase-3 project in Silivri, which has a strategic importance for our country, BOTAŞ, with our own payroll personnel, full-time (TPI) Under the supervision of third eye quality control inspectors (Botaş/Petrofac/KKJV), the manufacturing works and assembly works were successfully completed at Sefine Shipyard. In addition, all heat treatment (stress relief) and non-destructive inspections in the process were coordinated in accordance with the project schedule by using sub-contractors.