Klara Marcus survived the gas chambers because it ran out of gas.
"My mother and older sisters were taken directly to Auschwitz. I never saw them again,' Klara Markus told a Romanian newspaper in 2010."
"When I asked about them, SS members replied shortly: "Maybe, you should search for them in the smoke or ashes!" and they laughed.'"
"The mother-of-two remained in Budapest for another two years, before the Nazis ordered the remaining Jews in the city to march toward the concentration camps."
Mrs. Marcus just turned 100.
Mazel Tov and G-d bless.