Question: The "Deepwater Horizon" oil spill for which Peter V. Neffenger was the Deputy Nation Incident Commander, killed how many people in total?
Sentence (from "Deepwater Horizon oil spill"): Killing eleven people, it is considered the largest marine oil spill in the history of the petroleum industry and estimated to be 8% to 31% larger in volume than the previous largest, the Ixtoc I oil spill.
Relevant evidence: Yes