The Secret City Under Detroit That Almost Nobody Is Allowed to See

Beneath the streets of Detroit lies a hidden world most people will never see. Far below the traffic, abandoned factories, and towering buildings is a network of forgotten tunnels, sealed passages, utility corridors, and underground spaces built during the city’s industrial rise. Some were designed to move workers and materials unseen. Others carried steam, power, and infrastructure beneath one of America’s most important manufacturing cities. But as Detroit changed, much of this underground world disappeared from public view. Entrances were sealed. Entire sections were abandoned. Others remain active and heavily restricted — accessible only to workers, engineers, or those with special permission. So how extensive is Detroit’s hidden underground network? Why was so much built beneath the city in the first place? And what still exists down there today? In this documentary, we explore the forgotten infrastructure beneath Detroit, separate fact from urban legend, and uncover the story of the secret city hiding beneath the streets. Detroit may look abandoned in places above ground. But underneath it, another city has been there all along.