Key facts
- NYC officials have warned of extreme dangers in the sewer system.
- Sightings of individuals roaming the sewer system have been reported.
- Police are investigating videos of men emerging from manholes.
- Officials described the sewer environment as 'extremely dangerous'.
New York City officials have issued a warning about the extreme dangers present within the city's sewer system. This advisory follows reports and videos of individuals seen roaming the underground network. The police department has launched an investigation into these mysterious appearances, emphasizing that the sewer environment is treacherous and potentially hazardous.