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Description
About those doors. There are four of them, which you can see in this special cutaway view. The outermost appears to be several inches of solid steel which is pivoted at the top. Next is a set of steel bars. After that is a panel packed nearly solid with coils of razor wire, and then finally a block of granite several feet thick which is lowered into place last, its mass cutting you off from the rest of the tunnel you've been stuffed into. The rest of the walls are reinforced concrete, so you can see, there is no way out.

Description
About those doors. There are four of them, which you can see in this special cutaway view. The outermost appears to be several inches of solid steel which is pivoted at the top. Next is a set of steel bars. After that is a panel packed nearly solid with coils of razor wire, and then finally a block of granite several feet thick which is lowered into place last, its mass cutting you off from the rest of the tunnel you've been stuffed into. The rest of the walls are reinforced concrete, so you can see, there is no way out.