"The Nest" Bunker image - Lost World: Rise of the Ancients Mod for Half-Life 2

Brazilian developers seeking to expand into the Amazon in the hope of building a new city in a recently authorized site west of Manaus, during the clearing process they unknowingly destroy a natural barrier that untill now had kept a "Lost World" of ancient creatures contained from the rest of South America. A decade has passed and the city is now well under construction with several thousand residents already living in the new city of Egesea. The creatures, having roamed free unoticed underwent a population boom, the native wildlife, unable to cope with the prehistoric beasts have fallen prey to the smaller Dinosaurian predators, who in turn feed the giant super-predators. The Herbivores that were contained in the lost world also flourished, feeding on the new, rich vegetation that is now available to them, they were the first to be seen by the residents of Egesea. News spread fast, only to be shot down as a tabloid rumor. Then the predators arrived, having followed the herbivores....