There was an accident in an underground laboratory that produced biological weapons and a huge leak as a result. The entire staff was killed, but after a month in the laboratory sensors showed signs of life. You are sent in there to find out what was going on, and to demolish the lab.

There was an accident in an underground laboratory that produced biological weapons and a huge leak as a result. The entire staff was killed, but after a month in the laboratory sensors showed signs of life. You are sent in there to find out what was going on, and to demolish the lab.

There was an accident in an underground laboratory that produced biological weapons and a huge leak as a result. The entire staff was killed, but after a month in the laboratory sensors showed signs of life. You are sent in there to find out what was going on, and to demolish the lab.