In October 1964, a research expedition was organized, the purpose of which was to study the underground temple ancient city of Teotihuacan 40 km northeast of Mexico City. In the central part of the complex, along the walls of the Temple of the Feathered Serpent, massive splits of the earth arose, the reasons for which were not exactly established. But the most mysterious waited a couple of hundred meters in depth. A whole multi-level network of underground structures, extending geographically within all ground structures, such as the pyramids of the Moon and the Sun. The appearance of the buildings, many artifacts and technologies discovered during the study did not leave doubts about their extraterrestrial origin. After a few days, all the events had to be urgently stopped due to the sharply worsening condition of the expedition members. The bowels of the underground city kept in themselves not only the secrets of centuries, but also harmful radiation, similar to radiation. The event ended in tragedy, but the forces of the military, this story did not receive publicity. In just half a year, a new expedition was organized ...