Efforts to stem the Deepwater Horizon oil spill Efforts to stem the Deepwater Horizon oil spill Efforts to stem the "Deepwater Horizon" oil spill were ongoing from the time that the "Deepwater Horizon" exploded on 4/20/2010 until the well was sealed by a cap on July 15, 2010. Various species of dolphins and other mammals (61 casualties), birds (2,095 casualties), and the endangered sea turtles (467 casualties) have been killed either directly or indirectly by the oil spill. The "Deepwater Horizon" spill has surpassed in volume the 1989 "Exxon Valdez" oil spill as the largest ever to originate in U.S.-controlled waters; it is comparable to the 1979 Ixtoc
2011 Bohai Bay oil spill July 5, 2011. It was only revealed because of a public microblog tip-off that appeared on June 21. The news of the oil spill was withheld by the State Oceanic Administration (SOA) for a month. In a statement by the SOA, the US company ConocoPhillips managing the platform was held responsible for the leak, and was fined 200,000 yuan (US$31,000). CNOOC however, said they informed government authorities from the start. Outside of the spill area, dead seaweed and rotting fish can be seen around Nanhuangcheng island (南隍城島) in Shandong province. "The oil, containing toxic substances and heavy metals, will greatly