Mysterious airport tunnels to open beneath hub long tied to conspiracy theories

Denver International Airport is preparing to open portions of a mysterious underground tunnel system that has long been plagued by conspiracy theories.

Currently, travelers primarily move between concourses using the airport's underground train system.

Denver Mayor Mike Johnston acknowledged the airport's unusual reputation while discussing the project.

"Maybe along the way, travelers will finally get a closer look at the underground tunnels and decide for themselves what's fact and what's fiction," Johnston said in a statement released by the airport.

Airport officials said the new pedestrian walkways are part of Denver International Airport's broader "Vision 100" expansion plan aimed at preparing for future passenger growth.

Construction is expected to begin in 2027.

The project is estimated to cost between $300 million and $700 million.

It will be funded through airport revenue rather than taxpayer dollars, Denver International Airport CEO Phil Washington told CBS News.

Speculation surrounding the airport intensified after its opening in 1995 was delayed by more than a year and went billions of dollars over budget, according to reports.

The announcement quickly sparked reactions online, with many users joking about the airport's decades-old conspiracy theories.

"Be prepared to fight the lizard people along the way," one Reddit user wrote.

Others referenced the airport's famous blue horse sculpture.

"Praise Blucifer," another commenter joked.

Several travelers also welcomed the idea of having an alternative to the airport's train system.

"We've only been asking for this since before the airport opened," one Reddit user wrote.

Fox News Digital reached out to Denver International Airport for further comment.