Miller's stomach sank as soon as he heard the hiss from the creature. He quickly put the car in park and grabbed his assault rifle. He hurried over to McKenna. "I know you heard that.." He whispered next to her as he looked out into the tunnel. 

Another hiss sounded and the trotting of legs could be heard echoing through the tunnel. 

"Sounds like it's coming." He said as he backed up, trying to get a nice open area where the creature couldn't use objects to hide.

"Should we call for back up?" He asked.