You start off outside with small corridoors with cars blocking you for obstickels, then you can go underground with very long 4 corridorrs in a squre. Outside if you look up theres a long streek of dust in the air.
1. Unzip the file and extract the BSP (Map) file to a folder of your choice.
2. Copy the BSP file and paste it into the following folder : Program Files/Valve/Steam/SteamAppsfirstname.lastname@example.org/Counter-Strike Source/cstrike/maps
3. Start up Counter-Strike Source, Create game and select the map from the list!