 Complete the following phrase:  The Deepwater Horizon oil spill was a major industrial accident on the Gulf of Mexico, which killed 11 people and injured 16 others, leaked about of oil with plus or minus 10 uncertainty, which makes it the largest accidental marine oil spill in the history of the petroleum industry, and cost to the company more than 65 billion of cleanup costs, charges and penalties. On 20 April 2010, the semi-submersible exploratory offshore drilling rig Deepwater Horizon located in the Macondo Prospect in the Gulf of Mexico 