Just got a new deer lease down in Mullica off of Elwood road and while scouting it out, there are lots of old roads (now just paths) and what appears to be steep hills (embankments) and old depressions that may have been foundations. I think its a bit far from amatol track to have been part of that scene so I figured it was probably tied to the munitions factory. Here is what appears to be an entrace to an old sewer line, now out in the middle of the woods.