BP and Halliburton knew that the cement being used to seal the Macondo well in the Gulf of Mexico was not stable but "neither acted upon it," said Fred Bartlit, lead investigator for the presidential panel probing the oil spill. A number of tests conducted by Halliburton on the material indicated that the mixture would be faulty. BP, meanwhile, "misinterpreted or chose not to conduct" studies to determine cementing problems, Bartlit said.

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