Sensors surrounding one missile silo recorded a rapid rise in ground temperature( from -25 to -30F to 50 or 60F} within the space of 5-15 minutes. Simultaneously all the sensors on perimeter "fences" showed that whatever was occurring had not been initiated by something crossing the fences nor had any of the ground sensors indicated anything had "walked" by ground passage up to the missile site. Witness said he was told that the missile silo cover had been set aside, that "crew" from the unknown craft broke into the missile silo, and some of its "crew" were examining the circuitry of the ballistic missile. At least one observer on the U.S. military reaction team arrived to see "crew" scampering aboard the "craft". Apparently as is SOP, fighters scrambled. When the radar target appeared on the radar scopes within a few moments of the reaction team's "radioed" report, it was travelling straight up at a speed in excess of 50,000 miles an hour. It disappeared by moving outside the range of the radar his NORAD shift was using.