FILE - In this April 21, 2010 file photo taken in the Gulf of Mexico more than 50 miles southeast of Venice on Louisiana's tip, the Deepwater Horizon oil rig is seen burning. A BP scientist identified a previously unreported deposit of flammable gas that could have played a role in the Gulf of Mexico oil spill, but the oil giant failed to divulge the finding to government investigators for as long as a year, according to interviews and documents obtained by The Associated Press. (AP Photo/Gerald Herbert, File)

Associated Press
FILE - In this April 21, 2010 file photo taken in the Gulf of Mexico more than 50 miles southeast of Venice on Louisiana's tip, the Deepwater Horizon oil rig is seen burning. A BP scientist identified a previously unreported deposit of flammable gas that could have played a role in the Gulf of Mexico oil spill, but the oil giant failed to divulge the finding to government investigators for as long as a year, according to interviews and documents obtained by The Associated Press. (AP Photo/Gerald Herbert, File)
FILE - In this April 21, 2010 file photo taken in the Gulf of Mexico more than 50 miles southeast of Venice on Louisiana's tip, the Deepwater Horizon oil rig is seen burning. A BP scientist identified a previously unreported deposit of flammable gas that could have played a role in the Gulf of Mexico oil spill, but the oil giant failed to divulge the finding to government investigators for as long as a year, according to interviews and documents obtained by The Associated Press. (AP Photo/Gerald Herbert, File)
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