A preliminary examination of the spoils piles and the excavations suggests that this is a cut and fill site, rather than a series of entrances to deeply buried tunnels. A cut is a man-made feature resulting from cutting through raised ground, usually to form a level bed for a road, railroad track, or other construction. A fill is a man-made feature resulting from filling a low area, such as to form a level bed for a road or railroad track, or to fill in the excavation cut to emplace a hardened underground facility.