I don't believe there is anything in there. The way the game is laid out is that everything is of a standard size, and that things will be larger sometimes then what is needed for a particular scene, so it's submerged beneath the floor (rocks, stair cases) etc.. and some areas will have oddly colored blocks or piles of rocks sealing them off.
However, if you really want to check it out. You can always use the console command TLC or TCL I forget which one it is, that turns off the clipping in the game and allows you to walk through walls. Simple use the tilde "~" to bring up the console and type in TCL/TLC and then go through the wall look around then come back, and type it again to turn the clipping back on.
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