My dad trained Navy pilots during WW 2. I only asked him once if he ever saw any crashes or bad things.
He said a mechanic walked into a propeller a few feet from him.
He walked away and I got the definite message that he never wanted to talk about it again, so we didn’t.
I’ve seen photos of same. Don’t want to see them again.
My father was a crew chief on a PBY. They were training in Corpus Christi (IIRC) and he said that someone walked through a spinning propeller was not struck.. He was not so fortunate when he turned around and walked back through the same propeller.