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 "Peter V. Neffenger"): Previously to leading TSA, Neffenger was a Vice Admiral in the United States Coast Guard, serving as Vice Commandant of the United States Coast Guard since May 20, 2014.
Relevant evidence: No