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
Oil spill governance in the United States that it makes it a mandatory requirement for U.S. tank vessels, onshore and offshore facilities to establish and submit oil spill response plans to the corresponding federal authority. The OPA requires new vessels operating and transporting oil in U.S. waters to have double hulls. Not all vessels are of the same size and for the same purpose hence the OPA makes provision for exempting certain vessels from having double hulls. However, by 2015 it is a requirement by law that all oil carrying vessels operating in the U.S. must have double hulls. The legal framework for enforcing oil spill governance