The Phase II project of China's first self-developed ultra-deepwater gas field, Shenhai Yihao, or Deep Sea No. 1, delivered its first batch of crude oil on Wednesday after going into operation at the end of September. The project comprises 12 deepwater gas wells, a comprehensive processing platform weighing over 14,000 tonnes, and five submarine pipelines with a total length of about 250 kilometers, among other facilities. Once fully operational, the peak annual natural gas output of Deep Sea No. 1 is expected to rise from three billion cubic meters to 4.5 billion cubic meters.