Mexico City is built on the slope of an active volcano, which may erupt at any moment, burying one of the world's great cities. Because of this volcanic uncertainty, there have been cameras trained on the volcano around the clock for years. And because so many video cameras are focused on this mountain, they have been able to capture record numbers of UFO videos. Many of these UFO videos feature silver, disc-shaped UFOs hovering over the volcano. Some debunkers claim that the silver discs in the UFO videos are only rocks being thrown out of the volcano, but this is nonsense. The craft seen in all the UFO videos that I've seen look too symmetrical to be manmade objects. As long as this volcano is active, it appears that Mexican UFOlogists will be able to capture these amazing UFO videos.