RussiaToday--October 29, 2010--An investigation into the Gulf of Mexico oil spill has revealed that BP and its contractor were aware of flaws in the cement mix used to build the rig. A US presidential commission says that could have caused the blowout. The report also claims four separate lab tests were carried out - but only one showed that the cement was suitable for deepwater drilling. The April rig explosion killed 11 workers and caused the worst environmental disaster in US history.
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