It’s a real hellhole.

A hole opened on a crumbling sidewalk near Battery Park that briefly gave passersby a peephole into the subway — and a reality check about how thin the ground actually is.

The baseball-sized hole in the asphalt of Battery Place and State Street opened sometime last week, according to a hair-raising Instagram video, but it has since been covered with an orange traffic cone bolted to the ground.

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The wild video shows light apparently emanating from the hole, which lands smack in the middle of a blacktop patch on the walkway.

The hole also runs deep, apparently going between a layer of concrete and the ceiling of the Bowling Green subway station, the video shows, offering sightseeing touri

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