On October 10, 2024, at around 4:23 p.m., some 27,000 pounds of toxic hydrogen sulfide gas were released during a maintenance activity at the PEMEX Deer Park Refinery in Deer Park, Texas. The refinery makes more than a quarter of a million barrels per day of motor fuels, like gasoline, diesel, and jet fuel, that are exported to the U.S., Mexico, and Latin America. The toxic release fatally injured a pair of contract workers and injured several others. So, what happened?

Instead of opening a pipe flange on empty piping, contract workers from industrial service company Repcon, Inc. -- which specializes in welding, pipe fabrication, and maintenance -- mistakenly opened identical piping about five feet away that contained hydrogen sulfide gas. The pipe released pressurized hydrogen sulfide gas and fatally injured one of the Repcon workers.

The hydrogen sulfide traveled downwind, where a worker from ISC Constructors, an industrial engineering and construction company, inhaled the toxic hydrogen sulfide and was also fatally injured.

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