A villager displays his hand coated in crude oil during cleanup efforts almost a week after a pipeline, owned by China Nation Petroleum Corp., exploded in Nanhaitun, Weitang Bay, China. China National Petroleum Corp. said Thursday the vital pipeline has resumed operations after an explosion caused the country's largest reported oil spill. Cleanup efforts, marred by the drowning death of a worker, continued over a 165-square-mile stretch of water blanketed in thick, dark oil Thursday, after an official warned the spill posed a severe threat to sea life and water quality.