One of the many early opening maps to Half-Life: Cold Shift.
One of the many early opening maps to Cold Shift, this was the last one before I cancelled the mod. It was last edited mid-February this year. I don't exactly know which wads you'll need to run it but here are the ones I think you need:
OPFOR.wad (opposing force textures)
barney.wad (blue shift textures)