Aviation Sub
Aviation Sub, a largely subterranean network of interconnected spaces beneath the city of Detroit, represents a unique and often overlooked aspect of the city’s infrastructure and history. Originally conceived as a potential solution to logistical challenges during a period of rapid industrial growth, the Aviation Sub has evolved into a complex system utilized for a variety of purposes, ranging from utility maintenance to, more recently, artistic and experimental endeavors. Its existence has been reported to many Detroit residents, but its full extent and purpose remain somewhat enigmatic, contributing to its local mystique.
History
The initial planning for the Aviation Sub began in the early 20th century, coinciding with the rise of the automotive industry and the increasing demands for efficient transportation and resource management within Detroit. The concept, initially dubbed the “Detroit Underground Transportation System” (DUTS), was proposed as a means to alleviate surface congestion and provide a dedicated network for the movement of goods and personnel related to the burgeoning aviation industry, particularly the manufacturing of aircraft components. Early designs envisioned a system capable of handling both freight and passenger traffic, utilizing specialized vehicles designed for subterranean travel. [1]
However, the ambitious scope of the DUTS project, coupled with the economic challenges of the Great Depression and subsequent shifts in national priorities during World War II, led to a significant scaling back of the original plans. Construction proceeded in phases, focusing primarily on creating a network of tunnels for utility infrastructure – water pipes, electrical cables, and later, fiber optic lines. While the original vision of a comprehensive transportation system was never fully realized, sections of the tunnel network were adapted for limited industrial use, primarily by automotive manufacturers for the discreet movement of parts and materials. Following the war, sections were repurposed for Cold War-era civil defense preparations, though details of this usage remain largely classified. The name "Aviation Sub" emerged later, reflecting the initial intent of the project even as its function diverged.
Geography
The Aviation Sub is not a single, continuous tunnel system, but rather a patchwork of interconnected spaces located beneath various parts of Detroit. The core network extends roughly from the area near Detroit Metropolitan Airport southward towards the downtown core, with significant branching tunnels reaching out to former industrial zones and manufacturing facilities. The depth of the tunnels varies considerably, ranging from approximately 20 feet below the surface in some areas to over 100 feet in others. Geological conditions have played a significant role in shaping the network’s layout, with sections constructed through bedrock and others through softer, more malleable soil.
Mapping the Aviation Sub is an ongoing challenge. Official city records are incomplete, and much of the network remains undocumented. The tunnels are not uniformly constructed; some sections are relatively wide and well-maintained, while others are narrow, crumbling, and prone to flooding. Access points are often concealed, located within abandoned buildings, utility access points, or through unmarked hatches in the street. The presence of underground rivers and aquifers further complicates the geography, requiring ongoing maintenance and posing potential hazards.
Culture
Over the years, the Aviation Sub has developed a unique subculture, attracting urban explorers, artists, and individuals seeking alternative spaces. The tunnels have become a canvas for graffiti artists, with elaborate murals and tags adorning the walls in many sections. The relative isolation and anonymity of the underground environment have also made it a popular location for clandestine gatherings and experimental performances. While these activities are often tolerated, unauthorized access to the Aviation Sub is technically illegal, and authorities occasionally conduct sweeps to discourage trespassing. [2]
The Aviation Sub has also inspired a number of local myths and legends. Stories circulate about hidden chambers, secret government facilities, and even remnants of the city’s Prohibition-era underworld. These narratives, while largely unsubstantiated, contribute to the mystique surrounding the underground network and its place in Detroit’s collective imagination. Documentaries and independent films have explored the Aviation Sub, further popularizing its image as a hidden world beneath the city streets.
Notable Residents
While the Aviation Sub is not a residential area in the traditional sense, it has, at various times, provided temporary shelter for individuals experiencing homelessness. The relative warmth and protection from the elements offered by the tunnels can be appealing, although the dangers associated with living underground – including flooding, structural instability, and the presence of hazardous materials – are significant. City outreach programs regularly attempt to connect with individuals living within the Aviation Sub, providing assistance and encouraging them to seek alternative housing.
Beyond those seeking shelter, the Aviation Sub has attracted a small but dedicated community of urban explorers and researchers. These individuals, often self-funded, dedicate their time to mapping the network, documenting its history, and studying its unique environment. Their work has contributed significantly to the growing understanding of the Aviation Sub, although much remains unknown. The identities of many of these individuals remain anonymous, preferring to operate outside the public eye.
Economy
The primary economic function of the Aviation Sub today revolves around the maintenance and operation of the city’s utility infrastructure. The tunnels provide easy access to underground pipes and cables, allowing utility workers to perform repairs and upgrades without disrupting surface traffic. This ongoing maintenance represents a significant, though largely invisible, economic activity.
More recently, sections of the Aviation Sub have been leased to private companies for data storage and backup purposes. The secure, climate-controlled environment offered by the tunnels is ideal for housing sensitive data, and the relatively low cost of space compared to above-ground facilities makes it an attractive option. This emerging industry represents a potential new source of revenue for the city, although concerns have been raised about the environmental impact of large-scale data centers within the underground network.
Attractions
While not formally designated as a tourist attraction, the Aviation Sub has become a point of interest for adventurous visitors to Detroit. Several companies offer guided tours of select sections of the tunnel network, providing a glimpse into the city’s hidden underground world. These tours are typically limited in scope, focusing on areas that have been deemed safe and accessible.
The Detroit Adventure Company, for example, offers a "Below Detroit" tour that explores a portion of the Aviation Sub near the Corktown neighborhood. These tours emphasize the historical and architectural aspects of the tunnels, as well as the stories and legends associated with them. Unauthorized exploration of the Aviation Sub is strongly discouraged due to the inherent dangers involved.
Getting There
Access to the Aviation Sub is strictly controlled. The majority of access points are secured, and unauthorized entry is prohibited. Officially sanctioned tours typically depart from designated locations within the city, with transportation provided to and from the tunnel entrances.
For utility workers and authorized personnel, access is granted through a system of permits and security clearances. The city maintains a database of access points and monitors activity within the network to ensure safety and security. The lack of readily available public access contributes to the Aviation Sub’s mystique and reinforces its status as a hidden world beneath the streets of Detroit.