A terrifying video has surfaced showing a knife-wielding man in a full ski mask aggressively threatening to kill another man inside a Bronx subway station.

The shocking footage, posted Saturday on X, captures the brazen confrontation at the 183rd Street station on the IRT Jerome Avenue Line during a sweltering 90-degree day.

In the clip, the masked suspect, wearing a black tank top, blue cargo shorts and a black balaclava completely covering his head and face is seen clutching a knife and getting in the face of a bearded commuter.

The victim, who appears to have just grabbed food, is holding a NY Pizza Suprema box and a plastic bag as the attacker rages and gestures wildly with the blade.

Despite the brutal summer heat, the knife-wielding maniac keeps his ski mask on throughout the tense encounter near the station’s turnstiles and emergency exit area.

The victim stays relatively calm and stands his ground as the suspect circles and threatens him, at one point appearing to say he’s going to kill him.No police officers or bystanders intervene in the video, and it’s unclear if the victim was injured or if the attacker was arrested.

The disturbing incident has sparked outrage online, with many calling it yet another example of the chaos plaguing New York City’s subway system.

“Wild footage,” the original poster captioned it. Viewers quickly piled on, slamming the lack of safety in the transit system.

The NYPD has not yet issued a statement on the specific case shown in the viral clip.

The video underscores the ongoing fears of straphangers who say they’re forced to navigate increasingly dangerous stations and platforms while city officials struggle to restore order. This one went down on a holiday weekend in broad daylight, ski mask and all.