Half-Life: Opposing Force Playthrough - (Part 7)

Part 7 of the Walkthrough.

Details Adrian Shephard and other HECU soldier's attempt to find and use an old transit system to escape to the Lambda Core, after battling through an office complex filled with aliens. It is also the chapter in which the Black Ops are first introduced. Shephard comes across them in a hangar where they are loading a nuclear warhead into the back of a truck. This is where the player learns that the Black Ops soldiers have been sent to kill the remaining HECU Marines and cover up the Black Mesa incident. Shephard meets up with several other surviving marines and fights the Black Ops, eventually reaching an underground railway system that leads to the Lambda complex.