This map has been based on the SDK version of the "ATP" location in S.T.A.L.K.E.R. game.
The map is not a copy or reproduction of the original location, but rather an attempt to make a free-style remix, barely preserving the initial buildings layout.
Some models and a few textures were borrowed from the original S.T.A.L.K.E.R. game. Most materials are custom.