On a clear February evening in 2020, a smell of rotten eggs started to waft over the small town of Satartia, Mississippi, followed by a green-tinged cloud. A load roar could be heard near the highway that passes the town.

Soon, nearby residents started to feel dizzy, some even passed out or lay on the ground shaking, unable to breathe. Cars, inexplicably, cut out, their drivers leaving them abandoned with the doors open on the highway.

“It was like something you see in a movie, like a zombie apocalypse,” said Jerry Briggs, a fire coordinator from nearby Warren county who was tasked with knocking on the doors of residents to get them to evacuate. Briggs and most of his colleagues were wearing breathing apparatus – one deputy who didn’t do so almost collapsed and had to be carried away.

Unbeknown to residents and emergency responders, a pipeline carrying carbon dioxide near Satartia had ruptured and its contents were gushing out, robbing oxygen from people and internal combustion engines in cars alike.