Su Ming stopped outside the house and stood in the dark like a hunter. He stared at the house for a moment. Then slowly, he frowned. He quickly went up to the house and opened the door. There was no one inside.
"Interesting," Su Ming mumbled to himself. He looked at his surroundings. There was a hole on the ground at the end of the house.
He hesitated for a moment, then squatted down by the hole and observed it for a moment. He also touched the insides of the hole. Its walls were made of dirt and they were dry. It was obvious that the hole had existed for a long time.
His eyes gleamed and he jumped into the hole. There was a tunnel in there. Su Ming ran along the tunnel without making a sound. As he moved forward, he began to determine where the tunnel headed. It was not hard to tell that it led outside the mudstone city.
