This is just a short backstory to set up my environment piece and the potential level. In 2011 an unknown virus infected the worlds population making the recently deceased rise up and hunt the living. It’s been 6 years since then and you are a survivor moving from place to place. One day you wake up inside some sort of leisure/activities center (in the UK) that was initial used as a small military outpost for civilian evacuation and medical treatment. Over the years it has been ransacked and used by multiple survivors to take shelter and live inside. You have no recollection of how you ended up there so need to explore the area and find out where you are and how to get out.