Illusion in the Tunnel

As the tunnel shook, so did the lights on the wall. The flickering lights highlighted the palaeolithic symbols and the Bone Oracle Script for worm. They had less than 1 hour left. Gu Jun and his group had made quite a distance down the tunnel. They passed three junctions and took multiple turns. Yu Chi used the symbols on the wall to determine their direction. However, they did not move any closer to the source of the mumbling chanting. As a result, Yu Chi became more agitated. He started to second-doubt himself.