McKenna brought her pistol, and kept it aimed towards where she had heard the hissing. She took a deep breath, and tried to use all of her senses, in order to determine where exactly the intruder was, as well as try to figure what its next move would be. She looked over at Miller; her heart was starting to pick up speed, as she continued to stare into the darkness of the tunnel. 

It would be of no surprise that this was the noise of a 'Xeno', and McKenna knew they would be a big trouble if they allow it to keep on living. They still had to find the child, and she also felt that it was her responsibility to make sure that they all get out of this alive. 

She reached for her walkie, and whispered into it. "Everybody, be steady. We're right on top of something".

Hearing Miller's question, McKenna looked around her. "If there are more fresh bodies, not too long ago, we just may be standing in one. Unless this one is alone", a thought came to her, making her grab the walkie again. "Viper, keep an eye out for corpses that are recent. We might be standing in for an ambush", the brunette then slowly took hold of her pistol again. 

It went quiet again....until she heard a scream behind them.