Part 3 of the Walkthrough.
As the battle begins to favor the Xen aliens, Shephard realizes the military forces have been ordered to pull out.
Details Adrian Shephard's attempt to reach the HECU's extraction point to escape Black Mesa. He has first eye contact with the mysterious Race X that seems to be collecting humans for study in their world. Shephard reaches the extraction point, but is deliberately left behind due to the G-Man's actions.