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
Deepwater Horizon oil spill be appealed. Barbier ruled that BP had acted with “conscious disregard of known risks" and rejected BP's assertion that other parties were equally responsible for the oil spill. His ruling stated that BP "employees took risks that led to the largest environmental disaster in U.S. history,” that the company was “reckless,” and determined that several crucial BP decisions were “primarily driven by a desire to save time and money, rather than ensuring that the well was secure.” The ruling means that BP, which had already spent more than $28 billion on cleanup costs and damage claims, may be liable for