The largest investigation of UFOs in the history of the world ... was launched by the former USSR in the late 1970s. Back in September, Congress heard testimony about once-classified files from the Russian UFO programs, files that fell into the hands ... journalist George Knapp in the 1990s, who brought those files out of Russia and is now making them public, starting with two of the most important documents. Could UFOs ignite an apocalyptic World War? It almost happened in October 1982 at a Russian nuclear missile base in what is now Ukraine. One document contains some of the eyewitness statements collected by a secret Ministry of Defense program. The witnesses were stationed at a missile base near the hamlet of Usovo. They watched in awe as multiple unknown objects flooded the skies, changed shapes and colors, appeared and then disappeared, traveled at high speeds, and stopped mid-air. A few officers made drawings of the different UFO formations seen over a wide area around and over the base. The most dramatic statement was from a senior communications officer who watched in horror as the launch control system for the missiles suddenly lit up and someone, somehow, entered the proper codes that would unleash hell. Nuclear missiles that could reach and obliterate New York City in a mere 25 minutes were ready to launch. And the Russians were powerless to stop it. As soon as the unknown objects over the base vanished, the launch sequence ended. Note: Our 26-minute video UFO Disclosure: Breakthrough Technology and Awakening Human Consciousness features interviews with leading experts along with well-sourced, verifiable information to help you make sense of this fascinating issue and its immense potential to transform our world. For more, explore the comprehensive resources provided in our UFO Information Center. - CBS News (Las Vegas affiliate)