New York City police are investigating multiple videos and reported sightings that show groups of people entering and later emerging from sewer manholes in recent weeks. Footage shared on social media depicts individuals climbing through manholes at night in different areas, including Brooklyn and Queens. One incident referenced by outlets includes video recorded around 29 May at or near the intersection of Bedford Avenue and Lynch Street in Brooklyn, showing seven people climbing through a manhole. Additional reporting points to similar behavior captured in other locations, such as Astoria in Queens, where surveillance footage shows three men approaching a manhole and working together to remove the cover. Concern among residents follows the spread of the videos and online speculation about what the people are doing underground. Police say they respond to ensure there is no threat to public safety and that, after Emergency Services Unit officers enter the sewer system to check for potential hazards, nothing is found. Authorities continue investigating the circumstances surrounding the manhole activity and who is involved.