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
Refugio oil spill years. Another new law provides for making oil spill response times faster and more effective. Finally, a new law will force intrastate pipelines to use the best-known technology such as automatic shut-off valves. The Pipeline Hazardous Material Safety Administration (PHMSA) is responsible for developing and enforcing regulations for pipeline operation transportation having been created in 2004 within the United States Department of Transportation. In the months following the spill, they found that the in-line inspection tool used by Plains in Line 901 and Line 903 had miscalculated the degree of corrosion. The company also withheld in-line inspection data so “it