Dead Bunker 4 Apocalypse

Action-horror, where you continue to play as the mercenary, which was sent to the secret laboratory for to get the workings out.
While you were searching for the necessary documents, something terrible has happened...
Virus has broken loose!
Those people who was able to stay alive, gathered into the groups and tried to resist infected.
Scientists were trying to find the necessary information about the disease and invent an antivirus.
Fight for the surviving began!
But you do have got everything to stop the epidemic.The results of the runaway experiment at large.
Object B-18 is destroyed, but the mischief has broken loose - the mischief that destroys everything on its way, changed all living things into dead.
How can we stop the epidemic right now.
Or there is the only way - to try to survive?