Halliburton ran computer surveillance after the Horizon , prosecutors say . Prosecutors charge a senior manager as the company pleaded guilty . The Deepwater Horizon blowout killed 11 and unleashed the worst U.S. oil spill . But prosecutors accused Halliburton of running computer simulations in May and June 2010 that showed `` little difference '' between the 21 centralizers it says it recommended and the six BP eventually used -- and then destroying the results . Well owner BP and Halliburton are still battling over the disaster in court .
Halliburton ran computer surveillance after the Horizon , prosecutors say . Prosecutors charge a senior manager as the company pleaded guilty . The Deepwater Horizon blowout killed 11 and unleashed the worst U.S. oil spill . Well owner BP and Halliburton are still battling over the disaster in court .