What was that thing in the Unatco ruins?

Inside Unatco HQ there's a pile of debris and junk. Beyond the stuff is some kind of item, as it is clearly visible with the vision enhancement aug. I don't know what it is, as I could never reach it because it appears to be inside the debris. It's been a while, but I think it looked like some kind of gun. I'm pretty sure I blasted the pile with concussion grenades and probably rockets, all to no avail.

What is that thing under the junk? I've already searched for info and can't find anything. Am I the only one who noticed it?