After having their lunch, everyone logged in after 30 minutes and got together.
Before they logged off, Zhang Yang had killed all the monster around the area. Since elite tier monsters required five hours to respawn, the place was empty and bare when Zhang Yang, Han Ying Xue, and Wei Yan Er came back. All of them continued their journey and reached the end of the first part after three hours.
Technically, the entire tunnel simply followed the shape of the mountain from the inside. The spiral pathway led downwards to the lowest and deepest part of the mountain. Technically, Zhang Yang’s current position was a complete cycle from where they entered. If they could drill upwards, the entrance to the mountain would just be 50 meters up!