The Deepwater Horizon blowout killed 11 rig workers and unleashed the biggest oil spill in U.S. history . Halliburton destroyed computer tests after Deepwater Horizon , prosecutors say . Tests showed ` ` little difference '' between what it urged and what it did , they say . BP and Halliburton are still battling over the disaster in court . BP had accused BP of destroying computers in 2011 .
Halliburton destroyed computer tests after Deepwater Horizon , prosecutors say . Tests showed ` ` little difference '' between what it urged and what it did , they say . BP and Halliburton are still battling over the disaster in court . BP had accused BP of destroying computers in 2011 .