On Aug. 28th, 2009, Jack-up rig Nan Hai 4 has been gradually dry-docked Yiu Lian No.2 Drydock. Owing to the successful repair of Jack-up rig HYSY941 early this August, COSL sent Nan Hai 4 to Yiu Lian Dockyards (Shekou) Ltd. to carry out the conversion, which has been regarded as the full proof of our progress in offshore engineering. In view of the conversion of jacking system, the management group in advance calls out experts from the production department, the QC department and the technical department to ensure the work handled efficiently. Preparedness ensures success. On the basis of our accumulated experience, our shipyard is confident enough to complete the project conforming to the high standards.