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I may took my time psoting but it seems the three posts above me are already hinting at bioshock.
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Do you have any concept art and alike so i can work off and get a general theme? Otherwise im swinging in the dark. Reference pictures, your own concept work, briefs and plans are all important when you request media. It makes the difference between it being locked-buried and users wiling'ly helping you.
Detail is Everything. The more detail the more belivable it becomes. Right now i have a very generic area to cover. Whats more you havnt given a time or date to this. Near future tec, present, past, Breakthrough eras, Altered time lines. I can think of as many as the stars in the sky. So pick one and break it down, key aspects. Like are they using steam power, generic electricty, new age power, solar, nuclear. Combing two aspects can make a game, bioshock is a leading example. 60- 70's new age with a steampunk and broken catalyst setting.
What kind of hospital is it? scale is key for a player to be preoccupied in. How will the game progress? will the people become zombies, will they incubate or mutate? How does the outside world deal with it? is the whole world under siege or is it a single instance. What role will the characters play. How close will the users get to them.
I can on and on and on with this. And thats just with the three identifers you'v given.
Zombie, hospital, soldier.
If you can give me this detail ill work to my hearts content on whatever you give me. That goes for anyone else whos reading. A niche is what im after right now and if you can provide that, ill help.