The GM Electrovan used a fuel cell produced by Union Carbide, which was fueled by both super-cooled liquid hydrogen and liquid oxygen. Today's fuel cells use less pure oxygen that is native in the outside air. The Electrovan had one large tank for the hydrogen and one for the oxygen and contained 550-feet of piping throughout the rear of the vehicle, turning this 6-seat van into a 2-seater with barely enough room for 2 passengers.