 The fuel was Aerozine 50, a 50/50 mix of hydrazine and UDMH, and the oxidizer was nitrogen tetroxide.There were several accidents in Titan II silos resulting in loss of life and/or serious injuries.In August 1965, 53 construction workers were killed in Arkansas when hydraulic fluid used in the Titan II caught fire from a welder's torch in a missile silo northwest of Searcy.