In September 1942, Stangl supervised the building of new, larger gas chambers to augment the existing gas chambers. The new gas chambers became operational in early autumn 1942. It is believed that these death chambers were capable of killing 3,000 people in two hours, and 12,000 to 15,000 victims easily every day, with a maximum capacity of 22,000 deaths in 24 hours. According to Jankiel Wiernik: "When the new gas chambers were completed, the "Hauptsturmführer" came and remarked to the SS men who were with him: 'Finally the Jewish city is ready' ()".