Abstract: Employees #1 and #2 were working on an LPG truck loading rack; Employees #3, #5, and #6 were in the control cabin attempting to load their trucks; and Employee #4 was approximately 100 yd away in his truck when the rack exploded due to the injection of oxygen into mercaptan. Employees #3, #5 and #6 attempted to escape through the flames, inhaling smoke, flame, and chemicals. Employees #3 and #5 suffered respiratory damage and Employee #6 was burned on his back, arms, and shoulders. Employee #4, who left his vehicle and entered the fire to assist Employees #3, #5 and #6 in escaping, and to put out a fire on Employee #6, suffered lung damage from inhalation of fumes and smoke. Employees #1 and #2 were pronounced dead at the scene; they were so severely burned that they were identified through dental records. Employees #3, #4, #5 and #6 were admitted to St. Catherine's Hospital in East Chicago for treatment of lung damage as well as cuts, bruises, and abrasions.