NEW YORK (AP) — Mole people? Crocodile catchers? Mario brothers? A series of bizarre sightings of people popping in and out of New York City’s vast subterranean sewer system has the city wondering what exactly is going on, with police now probing the underground mystery.Security cameras have recorded at least three nighttime instances where groups of people entered or exited sewer tunnels via maintenance holes on streets in Brooklyn and Queens.In one video, taken early Friday morning in the Williamsburg section of Brooklyn, a group of roughly seven people were recorded popping out of a maintenance hole in the middle of an intersection, in full view of passing cars.Some wore headlamps and carried what appeared to be shovels and other tools. One narrowly missed getting run over by a vehicle as they pulled themselves out of the ground.

In another video, a group of about seven people could be seen emerging from a maintenance hole around 2 a.m. on a quiet street in Brooklyn’s Gravesend neighborhood. They made their way to a couple of parked cars and pulled out fresh clothes to change into. Police say the group entered the sewers about 11 p.m., meaning they could have been underground for three hours.