COSLProspector, the fourth deep-water semi-submersible drilling rig built by CIMC Raffles for China Oilfield Services Limited (COSL), has been delivered in Yantai, Shandong Province. It represents another milestone for China’s deep-water drilling rig going into the global mainstream market. The COSLProspector is a DP3 vessel with a length of 104.5 m, a width of 70.5 m, a height of 37.55 m, and an operating water depth of 1,500 m. It is able to drill 7,600m deep and has a designed operating temperature of minus 20 degrees Celsius.