Well, for the first time in 15 years, a camera crew was allowed inside the Denver Airport. Turns out there's a huge 4 story underground luggage carrier and the murals are "to save the enviornment." Seems to raise more questions than it answers
Here are some murals
I've never given this conspiracy much thought, but that guy that gives the Underground tour couldn't give her a straight answer!
She asks, "So, you are showing us everything right And he replies, "I am showing you everything that is..... well, everything that I..... everything I have found and know is here."
Even she says it isn't very convincing!