The Penglai 19-3 oilfield sits in Bohai Bay, operated by ConocoPhillips China, a subsidiary of the Houston-based oil giant ConocoPhillips. The field is jointly owned: 51 percent by China National Offshore Oil Corporation (CNOOC) and 49 percent by ConocoPhillips. The first spill, a seafloor leak, began on June 4 and lasted until June 7. Eleven days later, on June 17, a second spill occurred at the same oilfield, contained within 48 hours. This second leak came just one day after an explosion at a Huizhou refinery -- a coincidence that underscored how frequently China's offshore oil infrastructure was failing. Yet the public learned none of this as it happened. The disclosure gap between the spills and their announcement became the scandal within the scandal.

ConocoPhillips stated that the total volume spilled was equivalent to 1,500 barrels of oil. Chinese environmental organizations found this figure difficult to believe. Zhong Yu, senior action coordinator for Greenpeace, told the Xinhua news agency that the amount was 'questionable' because no third party had been involved in the assessment -- only ConocoPhillips and the State Oceanic Administration had attended. Beyond the spill zone, the environmental damage was visible. Dead seaweed and rotting fish appeared around Nanhuangcheng Island in Shandong Province, far enough from the oilfield to suggest the contamination had traveled. Eleven environmental organizations sent an open letter to ConocoPhillips China and CNOOC, asking both companies to allow independent investigators to visit the scene. The request highlighted a fundamental problem: without transparency, neither the scale of the damage nor the adequacy of the cleanup could be verified.

The 2011 spill was not an isolated incident. CNOOC had come under scrutiny for multiple accidents involving its Bohai Sea facilities, with the Penglai 19-3 spills representing the third such incident in less than two months. Shortly after, a spill at the Suizhong 36-1 oilfield forced a temporary shutdown. The Bohai Sea is one of the most industrialized bodies of water in China, ringed by oil platforms, shipping lanes, and fishing communities that depend on its health. Its semi-enclosed geography -- connected to the Yellow Sea only through the narrow Bohai Strait -- means that pollutants do not easily flush out. Oil that enters the Bohai tends to stay in the Bohai, circulating among the same fishing grounds and aquaculture operations that supply seafood to millions of people across northern China. The 2011 spill revealed how thin the margin was between industrial use and environmental catastrophe in these crowded, shallow waters.