Don't open, wrong chapter

In a dilapidated subway filled with a flood, the ark came to a stop and the main door opened slowly. Mack slowly came out of the ark and looked at the dark subway with a frown on his face. 

He jumped into the flood and the water reached his ankle. He squinted his brow and looked deep into the darkness for a couple of minutes before he raised his hand. 

Creak! 

A group of teams matched out of the train and jumped into the flood. They were all in the First Circle but had yet to form their core power. Every one of them was equipped with a rank 3 weapon as they arranged neatly at his back. 

"You know the mission. I won't condone any mistake." He said in a low voice as he signal with his hand. 

The group walked through the flood, making low noise as much as possible. The group of twenty men came out of the flood and walked with light steps toward the surface. 

"Why didn't you allow me to join the scouting team?" Leah asks in a low voice.