Zyklon B, or gas for that matter, isn't always used. Sometimes the inlet pipes release fire instead. Sometimes they are suffocated. Women, children, even the elderly aren't spared. On one such occasion, you can see entire families trying to survive through cardiopulmonary resuscitation, but such efforts are futile.

Description: https://pixelartmaker.fandom.com/wiki/User:MrTroublemeyer