no gas chamber victims were ever found? exactly. so, that means they were all incinerated. and i'm pretty sure no victims of zyklon b ever said anything except "gahaghaghahghaghahgahagah helppppp ghaaaa!" if you're referring to survivors of the holocaust, why would the soldiers care how long it takes to clear out? they're in the middle of a war and are executing people. they have full clothes and masks on to protect them. it's not like they walk in take deep breaths with t-shirts and shorts on. you don't need huge chimneys for zyklon b, and on top of that there are many chimneys where they incinerated jews.