Vilcabamba

This singleplayer map takes place in a recently discovered (and well preserved) ancient underground city somewhere in the Andes mountains. Scientist at Black Mesa discovered a very strong energy signal coming from there and established a base to investigate. Unfortunately, the army is also aware of this discovery and sent a squad. Contact has been lost with the scientific team so you must go and investigate the events.
This singleplayer map takes place in a recently discovered (and well preserved) ancient underground city somewhere in the Andes mountains. Scientist at Black Mesa discovered a very strong energy signal coming from there and established a base to investigate. Unfortunately, the army is also aware of this discovery and sent a squad. Contact has been lost with the scientific team so you must go and investigate the events.