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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.
The Deepwater Horizon drilling rig explosion was the April 20, 2010 explosion and subsequent fire on the Deepwater Horizon semi-submersible Mobile Offshore Drilling Unit (MODU), which was owned and operated by Transocean and drilling for BP in the Macondo Prospect oil field about 40 miles (60 km) southeast off the Louisiana coast.