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As if we needed any more evidence of BP’s culpability in the Gulf of Mexico oil disaster: The company expelled a safety crew from the Deepwater Horizon oil rig before it had a chance to perform a crucial test just hours before the rig actually exploded. BP never asked the crew to perform the so-called acoustic test, which a cementing company executive calls “the only test that can really determine the actual effectiveness” of the well’s seal. It is believed that the explosion was caused by failed cement seals, which were installed by Halliburton and which allowed for an explosive build-up of natural gas.