Lost Alpha is a free addon for S.T.A.L.K.E.R. - Shadow of Chernobyl.
I was walking down there again, haven't done that since 2009 Summer, when I recorded the "lost alpha sarcofag test" video, which can be seeon on youtube: Youtube.com
good old times :) now I used 2218 shaders, that's why it looks a bit oily, but that can be tweaked. Also the level was recompiled, we created a control room, plus some lockable rooms with devices and documents for the storyline :)