City of the Reptilians

Steven Cross, a man from a small town in Colorado goes climbing to the nearby mountains. As a result of a sudden and strong earthquake, several rifts open in the ground. From one of these, a mysterious artificial light drifts toward the surface. Giving in for his curiosity, the young man descends into the narrow hole. What he finds down there changes his life forever. A hidden, underground alien civilization opens up in front of him and holds him captive. During his adventures secrets are revealed like how humankind was created, and a danger which could wipe the human civilization from the face of the earth.