Is it true that there is an underground city/base under the Denver Airport which tunnels to Cheyenne Mountain?

I watched Jesse Ventura' Conspiracy Theory about 2012, it was an eye opener on off of these underground bases and tunnels and cities, is it true that NASA said there will be intense activity by the SUN in 2011 to 2012 which could knock out the world's power grid and that many people are building these underground shelters such as the one under the Denver Airport to ride out the catastrophe from the activity of the Sun??? And why aren't the politicians warning the world of this upcoming event if its real?