Several people are being seen entering and exiting manholes across New York City, according to police and city officials. On Sunday, shortly before 1 a.m., three men were observed entering a manhole in the Hamilton Heights area. When police arrived, the men were gone.

The latest report follows other recent incidents, including an October 9 case in which five people climbed out of a manhole on the Upper East Side. In that earlier incident, the group left in a black SUV and dropped shovels and other tools. Other locations cited by outlets include areas near Penn Station, Williamsburg, Bensonhurst, and Gravesend, along with additional incidents on Long Island since May.

Officials from the city’s Department of Environmental Protection (DEP) and police say the activity appears to be driven by people seeking valuables or scrap metal, sometimes believed to have washed away during storms. While they describe sewer entry as unsafe and illegal—citing hazards such as confined spaces, toxic gases, and flooding risk—officials say the incidents do not appear to pose a direct threat to the public.