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At the time of the stoppage, oil had been leaking continuously into the Gulf of Mexico for 85 days, 16 hours and 25 minutes since the Deepwater Horizon drilling rig exploded on April 20, 2010. Until July 19, 2010, there was no evidence that the well had ruptured, meaning that the cap appeared to be working.
It is considered to be one of the most devastating human-caused environmental disasters. The Valdez spill was the largest in US waters until the 2010 Deepwater Horizon oil spill, in terms of volume released. However, Prince William Sound's remote location, accessible only by helicopter, plane, or boat, made government and industry response efforts difficult and severely taxed existing plans for response.