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 .
Halliburton destroyed computer tests after Deepwater Horizon , prosecutors say . Prosecutors charge a company manager as the company pleads 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 .