- If the gas chambers were ventilated, the gas would kill people outside.
Nonsense; it is all a question of concentration. Once the gas is released into the atmosphere, its concentration drops and it is no longer dangerous. Also, HCN dissipates quickly. The execution gas chambers in US prisons are also ventilated directly into the atmosphere. Furthermore, if this argument would hold for the extermination chambers, it would hold for the delousing chambers as well, and one would have to conclude that no delousing chambers existed either.