Clouds
The very first attack from Xue Meng had collapsed the majority of the tunnel around Hao Xuan. He had to sprint at full speed for a fair few seconds to outrun the destruction and reach an area that was solid enough to withstand it.
Hao Xuan was so busy with dodging the falling debris in fact that he didn't even notice the tunnel splitting into two halfway. He had taken the smaller pathway that turned towards the right side while most of the footprints from everyone else that had entered before were going left.
"Damn it!" he tried to move a few boulders out of the way but there was only more debris and even more dirt and rocks. Even with his strength he would need tens of hours to dig his way back up without burying himself alive.
"Fuck," he cursed one last time before turning around and continuing down the tunnel.