DENVER (KDVR) — Conspiracies around Denver International Airport’s underground tunnel system have been popular for decades, but these newly built tunnels aren’t much of a secret. The airport ...

This theory first started because of the legend that there are miles of underground tunnels and secret buildings dug deep into the earth beneath the airport. According to Denver.org, it was first ...

Denver International Airport built underground tunnels, but it's not a secret portal ... upgrade to the aircraft deicing fluid collection system. The project creates additional storage ponds ...