It has been almost 2 years since the mysterious incident shut down the UAC base on Mars. Several months ago, one of the UAC satellites still monitoring the red planet detected a beacon originating from Site 1. This early research facility was long forgotten, even before the invasion. Now, you're a Marine combat engineer, part of the massive research and security team lead by Dr. Elizabeth McNeil. Your team is being sent back to Mars in an attempt to find and investigate the source of this strange signal. What you'll find, nobody knows, but hopefully it will offer new insight into the ancient civilization that once inhabited Mars.