Under the project called Bio-com, the Earthtek Corporation has locked 6 scientists in a deep underground vault to study the effects of isolation. The experiment has been ongoing for almost two years.
Unknown to everyone except one of the scientists, the fake isolation experiment hides Earthtek's real purpose: to use drug(s) to create super-soldiers.
A creature escapes the lab and kills a mouse and the base's cat. The creature can take over the body of whatever it inhabits.