Located on an ancient seabed in the southern part of the Chihuahua Desert, separated by low mountain ranges is Bolsom de Mapimi. It is said there is a strange magnetic condition about the land causing vortices to form that stretch into the upper atmosphere.
The land contains huge amounts of magnetic and uranium deposits. Some rocks feature an unusual content of rare metals such as ruthenium, rhodium, and a relatively stable isotope Technetium 97, that is radioactive. The area is abundant with physical oddities including abnormally large growth patterns in the vegetation and wildlife.
In 1964, Harry de la Pena, an engineer, surveyed a thirteen mile stretch of the desert preparing for an oil pipeline that would extend to Jimenez, Chihuahua. During his expedition, his team became frustrated when they continuously failed to maintain proper radio signal that was imperative in order to communicate between team members. They could find no explanation for why this was occurring. He described the area as "the zone of silence."
After the surveying was completed, Harry having great interest in the anomalies that had taken place, returned to investigate some more. Despite returning numerous times in an attempt to repeat the phenomena, he discovered the silent zones were not fixed, but in fact appeared to move around.
Strange encounters and unexplained occurrences appear in the night sky. Among these are glowing orbs and colorful flying triangular shapes. They measure approximately six feet across, have borders of prismatic color, with the inside containing translucent bands of shifting colors. Many times, they appear in a group of three, are equilateral and tilt at a 105-degree angle.
In 1976, the National Institute of Nuclear Energy sent two engineers to the Zone: Ray Cruz and Jorge Aguilera. The study was focused on Hertzian waves and indicated that the horizontal propagation of radio waves was normal. However, the vertical was cut off completely thus causing the phenomenon of "silence." They concluded this anomaly was not a function of position, but of time.