((I'd just like to point out the fact that no two adjacent rooms are the same color. The colors they can be are white, red, blue, green, and orange. The hatch bars can't be ripped off. Taking into account the fact that we have weapons and abilities, consider the hatch bars indestructible. Also, nothing can be melted, but if you have a sharp object, you'd be able to scratch something into a metal surface, like on one of the hatches, or on one of the places where there's metal on the walls, floor, or ceiling.
Below is a picture of one of the rooms, a white one. They're all the same, except the color. You can see the hatches in the center of both walls shown and the ceiling. There's also one of the other two walls and the floor.
Click here if image does not work.
Below is a close-up view of one of the hatches, so you get an idea of what the bar looks like and how the hatch works. It opens by turning the bar.
Click here if image does not work.
And there you are. That should give you a much better visual. I'm going to wait to do my actions, because I don't want my entry to be stretched, which I figure is what the pictures will do to this post.))