New York City's extensive sewer system, stretching over 7,400 miles (12,000 kilometers), has drawn the attention of urban explorers, including Steve Duncan, who shared insights into the challenges and dangers of navigating these underground tunnels. Recent surveillance footage has shown groups entering the sewers, prompting police investigations, although officials believe there is no immediate threat to public safety. Duncan, who spent years documenting these environments, noted that the most unpleasant aspect of the sewers is the presence of cockroaches. He described the tunnels as having a mix of historical architecture and natural waterways that were converted into sewers due to urban development. Despite the allure of exploration, Duncan warned of significant health risks, including exposure to pathogens and hazardous gases. Concerns have arisen among residents about potential illegal activities, as some explorers are equipped with tools that could suggest nefarious intentions. However, Duncan maintains that many explorers are motivated by curiosity and the desire to experience the city from a different perspective.