Hallin Marine, a Superior Energy Services company, says it has completed a unique project for COOEC Subsea Technology, a wholly-own subsidiary of COOEC (China Offshore Oil Engineering Company) which involved the replacement of 9 mooring lines beneath the floating production storage and offloading (FPSO) vessel HYSY111, while maintaining live operations. The oil and gas industry has previously witnessed the replacement of a single damaged mooring line replacement under such conditions; however this is the first time all FPSO mooring lines have been replaced as one continuous activity. The entire task was completed ahead of schedule without shutting down production on the facility, and with zero lost-time injury.