| This article is part of a series about the |
| Deepwater Horizon oil spill |
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The Deepwater Horizon oil spill was discovered on the afternoon of 22 April 2010 when a large oil slick began to spread at the former rig site.[1] According to the Flow Rate Technical Group, the leak amounted to about 4.9 million barrels (210 million US gal; 780,000 m3) of oil, exceeding the 1989 Exxon Valdez oil spill as the largest ever to originate in U.S.-controlled waters and the 1979 Ixtoc I oil spill as the largest spill in the Gulf of Mexico.[2][3] BP has challenged this calculation saying that it is overestimated as it includes over 810,000 barrels (34 million US gal; 129,000 m3) of oil which was collected before it could enter the Gulf waters.[4]
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