'Like the Ninja Turtles': Videos show groups climbing in and out of Brooklyn sewer manholes

The NYPD is investigating after groups of people were seen entering and exiting sewer manholes in Brooklyn, including incidents in Gravesend and Williamsburg. Police said seven people were seen entering a sewer in Gravesend and exiting hours later, while another group was seen entering a manhole in Williamsburg. Sources told the New York Post the incidents may involve people scavenging underground for valuables.