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
Prudhoe Bay oil spill Bay oil field, which would reduce Alaska North Slope oil production by an estimated 400,000 barrels per day. Later BP decided not to shut the western side of the field, meaning Prudhoe Bay would still produce about 200,000 barrels a day, half its normal total. Oil revenue accounts for 90% of Alaska's tax income. As a result of news of the shutdown, the price of crude oil on NYMEX jumped US$2.22 a barrel closing at US$76.98 per barrel. Following the Prudhoe Bay pipeline leak in March 2006, due to slow progress in stopping the oil spill, BP was forced to