On or about May 3, 2010, Halliburton established an internal working group to examine the Macondo disaster, including whether the number of centralizers used could have contributed to the blowout. According to the plea agreement, Halliburton’s cementing technology director instructed a senior program manager to run two computer simulations of the Macondo well’s final cementing job. When the simulations “indicated that there was little difference between using six and 21 centralizers,” the program manager “was directed to, and did, destroy these results,” the plea agreement said.