This single player story is set in the ruins of an “ancient South American civilization” (a mix of some of them to be precise). The story is quite simple. Scientists have detected a strong energy signal coming from those ruins and have established themselves there to investigate.Unfortunately they are not alone, and things start going wrong…
I remember this mod to be very good, you had a limited array of weapons and there were some pretty hard puzzles to solve.
The ending was a bit strange, but other than that...