Workers are seen as a helicopter land on the sixth-generation semi-submersible CNOOC 981 at the South China Sea, 320 kilometers southeast of Hong Kong, south China, May 7, 2012. The CNOOC 981 will begin operations on May 9, 2012 in a sea area at a water depth of 1,500 meters, China National Offshore Oil Corp. (CNOOC) said in a press release. This is the first deep-water drilling rig developed in China. [Xinhua]