Abstract: At 5:45 p.m. on November 17, 2015, Employee #1 and Employee #2 were performing repair work at a facility. Employee #1 was assigned to repair a crack that had developed in a 20,000 gallon stainless steel fat storage tank, while Employee #2 served as an attendant. Before work, atmospheric testing measured the oxygen level in the tank; however, its contents were not completely emptied. As Employee #1 was located inside the tank, performing TIG stick welding to repair the crack, an explosion occurred. Both Employees #1 and #2 suffered third-degree burns for which they were hospitalized and treated. Employee #1 died on December 25, 2015, as a result of his injuries, and Employee #2 was released from the hospital approximately two weeks from the time of the incident.