At 10:00 a.m. on November 23, 2018, two employees were working for a firm that provided support activities for oil and gas operations. Employee #1 and Employee #2 were part of a crew that was going to launch a pig from a pig launcher on a natural gas line. There were flammable vapors present. The flammable vapors were ignited by a NON-INTRINSICALLY-SAFE CORDLESS GREASE GUN. A flash fire ensued. Employee #1 and Employee #2 were both burned in the face. Employee #1 sustained a second-degree burn to his face. Employee #2 sustained a minor heat burn to his face. They were hospitalized.