Zombie Apocalypse mod for Half-Life

It's May 7th, and as you walk through the streets that are now deserted, a stench of rotting flesh courses through your nostrils sending a chill down your spine. You are just an innocent human caught in the middle of an apocalyptic world. But then again, whos innocent. You sit down to rest on the ground and hear the screams and cries of the undead gaining on you. You only hope to god you have enough energy left in those tired bones to continue running. The undead are scary enough, but being alone in this nightmare might just drive you to insanity. Alone, tired, and terrified, you pick yourself off the ground and start off again, not knowing if there are any survivors, wondering if this will be your last night amung the living... This mod is aiming for a very realistic Zombie Apocalyptic scene. The maps will be linked as if it were one huge world. There will be Safe cities, destroyed cities, and infested cities as well as rural, suburban, forest and much more area's to explore!...