human
Please generate a brief description of a foreboding scene inside a mine with granite and mortar.
assistant
The tunnel has been sealed off directly to the south. Thick chunks of granite are piled to the ceiling and filled with mortar to try to prevent anyone from proceeding further down the tunnel...or to prevent something from proceeding up the tunnel. The workmanship is not up to the usual dwarven standards, though, and shrinkage, or seismic activity, or something else totally unknown has caused a narrow but deep crevasse to appear on one side along the wall.