How did they shower during World War 2?

Well normal showers were just showers but it was different at concentration camp

the soldiers would say It's your lucky day go shower and you were doomed or not

sometimes you just shower but other times you take off your clothes go in a room and they would say go shower for 5 minutes and they would lock the door

and instead of water coming out gas came out and actually killed the people

and the sad thing is no one knew about this but it was not always gas sometimes it was just water and normally only kids went to shower