my friend james plays this game where you can build your own planet and put what ever you want in it

anyway, he's decided that 1 of the bits on his planet is going to be based around an asylum

he's all ready written the descriptions for the 3 wards, and the main hall, though struggling with the gas chamber. so... i need someone to write me a description of a gas chamber, but if you're actually standing in it. so a lot of his rooms start out by saying. you are standing in what ever....

all ideas i'll suggest to james, and i'm sure he'll use 1 of them for his planet

thanks