Blue Shift (100%) Walkthrough (Chapter 4: Captive Freight)
Barney Calhoun reaches the surface and encounters the Marines. He rescues some scientists who have been locked away in railway cars in Black Mesa's classification yards. He manages to fight through wave after wave of Marines and reach Dr. Rosenberg. He and a team of fellow scientists were trying to escape Black Mesa until the Marines caught them.
Rosenberg advises Calhoun that the entire facility is surrounded by Hazardous Environment Combat Unit Marines intent upon killing all base personnel to cover up Black Mesa's research into extradimensional exploration. The only way to escape, Rosenberg explains, is to use an old prototype of the Lambda Complex teleporter; if it works, they can reach an obscure entrance to Black Mesa which (hopefully) has been overlooked by the Marines.
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