Denver International Airport built underground tunnels, but it's not a secret portal and it doesn't connect to the underground city that's filled with lizard people. Instead, the newly finished 2,050-foot long, 11-foot diameter tunnel will come in handy during winter weather. Read more: https://www.9news.com/article/travel/dia-underground-tunnels/73-7b1308df-f13d-41cd-b1e9-a22ca4ab8127 More local videos here: https://youtube.com/@9news Subscribe to NEXT: https://youtube.com/@Nexton9NEWS Stay connected: 9NEWS Website: http://www.9news.com/ Facebook: https://www.facebook.com/ilike9news Twitter: https://twitter.com/9NEWS Instagram: https://www.instagram.com/9newsdenver/ Download the 9NEWS App: https://www.9news.com/appredirect/ Sign up for the 9NEWSLETTER: https://www.9news.com/email 9NEWS (KUSA) is located in Denver, Colorado.