You are standing just inside an underground tunnel which leads northwest to the surface and continues underground to the south. Dim lamps hang on the walls, providing light to this dark tunnel. Some of the aluminum cans and six-pack rings that you saw on the surface have fallen into the tunnel, but the six-pack rings down here are all still in one piece. They haven't broken down into smaller pieces. A path has been cleared through the litter, and it is much easier to walk here than it was on the surface. You notice a few batteries scattered on the path and decide that the lamps must be battery powered. You can exit the tunnel to the northwest or continue further into the tunnel.