Wooden doors have been used for secure buildings in many instances throughout history. How thick were these wooden doors? How were they hinged? **Are there multiple pictures of wooden doors on multiple gas chambers? How long did the gas take to incapacitate? Is it possible a wooden door could be used so suspicion would not arise when people were entering? Wouldn't a heavy metal door look a little odd in a shower room? Have any of you bothered to ask any of these critical questions to yourself?