I’ve watched literally dozens of movies on the holocaust and ww2, probably the vast majority of all the modern ones. I can envision in my head how it would go to have a cattle car of just these people unloaded and herded towards the showers, the kommando loudly announcing to remember le clothes hook number because they’ll need to get their clothes after, and and to head to le shower quickly so they can get le hot soup afterwards. then they can turn on le gas and drag le corpses out and be satisfied at the stains they removed from humanity.