The ultimate S.T.A.L.K.E.R. group

As you can see on the headline & steam news then you probably already know that the official prequel to the Most Atmospheric game of 2007, S.T.A.L.K.E.R. Shadow of Chernobyl, will be released only & exclusively on steam somewhere in mars 2008
The prequel is set somewhere in year 2011, a year prior to the first game
You are one of 4 members of the mercenary stalkers group which makes they way to the heart of the Zone which destabilizes it, and that doesn't make anything good.
Now, when everything and anything in the Zone has completely changed, you have to find a solution on how to stop this & of course...
SURVIVE...