5 years after the Gulf oil spill: What we know – CNN.com

(cnn.com/2015/04/14/us/gulf-oil-spill-unknowns/

CNN) On April 20, 2010, a final cement seal of an oil well in the Gulf of Mexico failed, causing what has been called the worst environmental disaster in U.S. history and taking the lives of 11 rig workers.
For 87 straight days, oil and methane gas spewed from an uncapped wellhead, 1 mile below the surface of the ocean.

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