The Denver International Airport needs almost $12 million for its tunnels and basements, but don’t worry: DIA officials swear it’s all for an overdue cleaning, and not to feed lizard people, Elvis or the illuminati. The real reason DIA needs $11.75 million is rather boring but necessary, he explains. Most of the work will be done by hand with wipes and vacuums outfitted with HEPA filters; the job isn’t very foreign to people accustomed to household cleaning, Krabbenhoft details. Denver is home to the third-busiest airport in the country, servicing almost 88 million passengers in 2024, according to Airports Council International. It was imperative that any company handling the tunnel cleaning could do so without having to shut down any terminals, Krabbenhoft notes.