Hi. This is my go at the Zombie Fiction Contest. It's a bit unusual, but different in concept than any of the other stories posted so far.
Hope you like it.

Dear diary..

I was lying on a cold metal floor, with no idea how I got here. I couldn't remember who I was. My head hurt bad, the pain was almost unbearable. I had to do something about it, or else I would've gotten insane.
I got up, and looked to see if anyone's around. The place looked hostile, and there was nobody in sight. Everything was dead quiet.
I reached a medical lab, where I found some morphine, and made use of it. The drug calmed me down, enough so I can focus my mind on a different task.
I went looking for other people, when I suddenly heard a bang. Followed by another, and another.
It seemed to be coming from a deeper level, so I went in its direction. I soon reached the source of the bangings. It was coming from a big vault-like structure. But what is making that noise? I decided to open the door, being fully aware that whatever is inside might not have the best intentions.
It was like I've opened death's door. There were horribly mutilated bodies lying in a big puddle of blood, with small pieces of flesh floating. But the bodies were very much lifeless. I stepped into the vault, and spoted three persons, wearing lab coats. Two male, one female. They didn't appear to pose a threat, though the scenery posed a sharp contrast.
"Thank God. We thought we'll never get out of here.", said one of them.
"I told you it was a good idea to bang on that door.", noded another.
"What's your name, kind sir?"
"I.. I can't remeber my name. I woke up less than an hour ago, on a floor. Something must've blacked me out. I can't remeber anything about who I am, or what I'm doing here."
"Well, my name is Dr. Rick Nauman, and these are Dr. Megan Richmond, and Dr. Michael Harp."
Megan: "Your head was hit pretty badly."
"..don't say. I manged to find some.. painkillers, but that won't hold me for long.. Anyway, what is this place? Where am I?"
Megan: "You're in the former Salem Nuclear Missile Silo, now known as The Hive Facility."
"What happened here?"
Mike: "Zombies, that's what happened."
Rick: "Well, zombies had breached the upper levels of the facility. Many took refuge here, but were already wounded, and had to be sacrificed, resulting in what you see here.."
"So, YOU killed these people?"
Mike: "Calm down. There is no way to revert the effects of infestation by a zombie.. We did what he had to do. It was necessary."
Rick: "My friend, I imagine this must be very confusing to you, but I must insist that we get to the communications chamber, and call for help."
"Okay.. Let's go."
Right then, we had no guns, or any means to fight back, in the event of an unpleasant surprise..

I was beginning to feel more and more tired, as we climbed each level.
"How much further?"
Rick: "Just one level up!"

In the end, we reached our destination.
"Is this it?"
Rick: "Yes."
Mike: "Let's check to see if the radio is still working corectlly."
"Well?"
Mike: "That's a relief. Everthing seems to be working good. I'll attempt to call for an emergency evac."
"Ok."
Mike: "Mayday, mayday. This is The Hive station, do you read?"
A voice responded..
Operator: "Yes, we read you. What's the situation down there?"
Mike: "Zombies have raided us. There are only 4 of us left, including me. We request immediate evac."
Operator: "Well, then we can't evac you if the LZ isn't safe."
Mike: "I think the zombies have left. Please, sir, you have to help us, you have to get us out of here!"
Operator: "That can't be correct, but ok, damn it. We'll send in an evac squad, stay put."
The doctors cheered at the sound of these words, though I remained hesitant..
"Don't get on your high horses yet, people."
Then, we had nothing left to do but wait for the cavalry.. with or without zombies lurking here.

Megan and Rick came to attend me with the long requested medical attention, while Mike stayed by the radio.
Rick: "Is your memory doing any better?", he asked, while cleaning up my wound.
"No. I still can't remeber a god damn thing.."
Megan: "I'm gonna ask you to stay still.. This might hurt a little."
"Ahhh.." Having alcohol torn on an open injury to the head, is not exactly the best thing that can happen to you.
Megan: "That's it. You're bandaged, and good to go."
I took a look around, for something that may trigger my memory. I couldn't find anything, but I did find an empty jurnal, and a pen, so I decided to document my experience, up to this point. As I wrote the first few lines, my memories started to catch-up with me. And they weren't memories of cheer..

"I remember.", I said, without much conscious thought.
Upon hearing this, Rick rushed me with questions.
Rick: "What do you remember?"
And almost more "generous" than a patient under hypnosis, I spilled everything..
"My name is Adam Saul, I had a wife and a little girl. Both burned alive, to avoid infestation. Now.. I have nothing."
Rick: "Oh my.. And what are you doing here?"
"I am responsabile with the security of level 2."
Rick: "Adam, what happened?"
"Security breach. Zombies, came in out of nowhere. We weren't ready for them. Everybody was running away, in panic. They slaughtered lots of people, at will."
Rick: "What happend to you? Why were you lying on that floor?"
"I.. was hit hard by one of the zombies, and passed out."
I could tell from the way he acted, that Rick was having frightening thoughts, going through his head.
He lift my bandage a little bit, and stared at the wound for a couple of seconds.. enough to reach his conclusion. He signaled Megan to get out of the room, and resumed talking to me.
Rick: "Oh my God.. Adam, listen to me, there is a fair posibility that you have been inf.."
Before he could finish that sentence, I felt a huge pain in my abdomen, as if my intestines were torn apart, and I throwed up blood all over the floor.
I was feeling sick and disorientated.. But after I recovered from this, I realized that Rick ran away.
That old bastard was gonna let me here for dead, while he's making his way to the chooper.

"They're not leaving me here.."
I now knew level 2 better than anyone, so I made my move, and sprinted to catch them.
I managed to get there, just a few moments ahead of them..
"What happened? Why did you leave your patient, doc?"
Megan: "Oh God.."
Mike: "Listen, we can work this out."
"It's beyond that, now.."
As I finished that sentence, I dropped to my knees, and almost felt the pain of death..
Rick: "Are you, eh, alright?"
I looked into his eyes, and said "..now.. you care to know, doctor?"
I noticed shadows moving little behind me. There was horror on everyone's faces..
Mike: "Adam? Just relax, ok? The chooper is right outside. Let's get ourselves rescued, alright? Help us, please!"
Then, I felt a foreign pressence, trying to take over me..

I made contact with another consciousness... The Director.
He immediatly put me on my feet, and guided my actions more throughly than I ever could.
"..it is done.", the bloodshed was over.

I rushed into a toilet, and crashed on the floor.
I'm looking at my hands, and see pieces of my skin starting to fall, like from a puzzle. By now, I lost all my hair, and dropped more weight, than I did in my entire life.
Yet, my mind is free, and I'm left alone, for now..

My arm is getting tired. I think I'll stop, now.
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THE END

Great work!

The journal style is a pretty good way of writing zombie stories. You've made good use of it too.

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Nice.

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Great Story.