Inside the Denver airport tunnels (and the huge plan to reuse them)

Denver International Airport plans to repurpose unused baggage tunnels into pedestrian walkways by 2029, aiming to address train system redundancy issues. The project, costing $300 million to $700 million, will allow passengers to walk between concourses instead of relying on trains. CEO Phil Washington emphasizes creating aesthetically pleasing tunnels with concessions and moving sidewalks.