They Went In After Him

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One year ago tonight, six men died in a dairy pump room in Colorado — and five of them died because the first one went down and nobody could stand there and watch. Today we’re pulling apart the deadliest pattern in confined-space work, the farm-shaped hole in the rulebook that let it happen, and two more hydrogen-sulfide deaths that hit the news this week. Five minutes. Let’s go.

It was a warm Wednesday evening on the plains 35 miles northeast of Denver. Around 6 p.m., a crew was working on the manure-management system at Prospect Valley Dairy when a pipe let go inside an enclosed pump room — dumping manure water and, with it, a cloud of hydrogen sulfide.

A worker for the equipment contractor and a dairy employee went in to stop the flow. The gas took them both. Then it happened the way it almost always happens: three more contractor employees and another dairy worker went into that pump room to pull their people out. When it was over, six men were dead.

Name the six, because they were not “fatalities” — they were somebody’s family. Alejandro Espinoza Cruz of Nunn. His 17-year-old son Oscar Espinoza Leos, a high school student. His other son, 29-year-old Carlos Espinoza Prado of Evans. Jorge Sanchez Pena, 36, of Greeley, related to the Espinozas by marriage. Ricardo Gomez Galvan, 40, of Keenesburg. And Noe Montanez Casanas, 32, a veterinarian working under a U.S. visa, whose remains were carried home to the Mexican state of Hidalgo. They ranged in age from 17 to 50. Four were from the same extended family. The Weld County Coroner’s Office confirmed the cause from autopsy and toxicology: hydrogen sulfide.

Here’s what you have to understand about that gas, because it explains the whole scene. Hydrogen sulfide smells like rotten eggs at low levels — but at high concentrations it does two evil things at once: it kills your sense of smell in seconds, so the warning shuts off, and it drops you where you stand. NIOSH puts the “immediately dangerous to life or health” line at 100 parts per million — one deep breath at that level and you are on the floor, a “knockdown.” OSHA caps H2S at a 20 ppm ceiling for a reason (29 CFR 1910.1000, Table Z-2). In that pump room the number was almost certainly a multiple of the deadly one. The man who went in second never had a chance to smell it, think about it, or turn around.

Name it and cite it — and this is the part that should make you angry. The rule that would have named this hazard has a hole in it exactly the shape of a farm. OSHA’s permit-required confined space standard — 29 CFR 1910.146, the one that says test the atmosphere before a body goes in, ventilate it, and never let a would-be rescuer enter without air supply and a retrieval plan — does not cover agriculture. Neither does the construction version. There is no OSHA confined-space standard for farms and dairies, even though grain bins, silos, and manure pits are some of the most reliable killers in the country. So when OSHA came in, it reached for the tools it still had: the General Duty Clause, Section 5(a)(1) of the OSH Act, and the Hazard Communication standard, 29 CFR 1910.1200, which does apply to agriculture and does require a written program and training on detecting hazardous gases.

On February 24, 2026, OSHA cited three companies for a total of $246,609. Dairy owner Prospect Ranch LLC took the largest hit, $132,406, for serious violations including failing to protect workers from atmospheric hazards, no written hazard communication program, and no training on detecting hazardous gases. Contractor Fiske Inc. — whose High Plains Robotics arm employed four of the dead — was cited $99,306 for failing to protect employees from a hazardous atmosphere and failing to provide hydrogen sulfide detection training. HD Builders was cited $14,897 for no written hazard communication program and no H2S training. A Purdue confined-space researcher put the fines in perspective: “peanuts compared to the civil liability.”

Translate it to the floor. The lesson of that pump room is not “be braver.” It is the opposite: the atmosphere kills the rescuer just as dead as the first victim. A confined space that took one person down is now a space that will take you down too — the gas did not leave when your buddy hit the ground. Before anyone enters, the air gets tested. If it is bad, it gets ventilated and re-tested. And the only person who goes in after a downed worker is someone on air — SCBA or supplied air — clipped to a retrieval line, with people topside who called for help first. The instinct to jump in is the most human thing in the world. It is also how a two-victim incident becomes a six-victim one.

Most of what we cover is the S, but the failure is almost always E, H, and S at once. Environmental: the source here was a manure-management system — the same lagoons and pits that, on any normal day, off-gas methane (a potent greenhouse gas), ammonia, and hydrogen sulfide into the air, and that are regulated for discharge to waterways under the Clean Water Act and EPA’s NPDES program precisely because manure water fouls creeks and groundwater. Honest and narrow on this one: the release stayed in the pump room — there is no verified record of an offsite spill or a poisoned stream from this incident — but the chemistry that killed these men is the exact same decomposition that makes manure a chronic air-and-water problem for every dairy town. Health: hydrogen sulfide is not only an asphyxiant of the moment — NIOSH and ATSDR document that survivors of high-level “knockdown” exposures can carry lasting neurological effects, from memory and balance to cognition, long after they walk out. The line that ties it together: the same weak point in the same manure system is an environmental hazard, a health hazard, and a safety hazard at once — one failure, three victims. Fix the atmosphere and you are chipping at all three.

This week the CSB said “hydrogen sulfide” again — different state, same script. On August 13, 2026, the U.S. Chemical Safety Board released an update on its investigation into the April 22, 2026 H2S release at the Catalyst Refiners facility in Institute, West Virginia (owned by Ames Goldsmith). Workers were disposing of chemicals during decommissioning when nitric acid hit a tank holding a sulfur-based precipitant, and the reaction fogged off hydrogen sulfide. Read the sequence and your stomach drops, because you have already read it above: an operator stopped the pump, went outside for air, and passed out; a supervisor came to check and lost consciousness; two more employees came to help — one of them died, and so did the other who entered the area. Two dead, four seriously injured, a one-mile shelter-in-place, 18 people taken to hospitals. The CSB’s finding so far: no written disposal procedure, respirators on site but not fitted with filters that stop H2S, and — say it with me — no personal gas monitors. So what for safety leaders: “decommissioning,” “cleanup,” and “we’re shutting this line down” are not low-hazard words. The chemicals are still there, the reactions are still possible, and the monitors have to stay on the person until the last drum is gone.

The pattern is not a coincidence — it is a trend line. The Catalyst Refiners deaths sit alongside the January 2026 fatal H2S release at the Woodland Pulp mill in Baileyville, Maine (CSB update issued in July), and a broader run that has federal investigators openly alarmed — reporting from C&EN this summer put the count at dozens of U.S. chemical-facility deaths in under a year, one of the worst stretches the CSB has tracked. So what for safety leaders: hydrogen sulfide does not care what industry you are in — dairy, pulp mill, refinery, wastewater. It kills the same way every time, and it kills the rescuer second. If your people work anywhere near sulfur, manure, decay, or wastewater, the two cheapest controls on earth — a calibrated gas monitor that is actually turned on, and a hard rule that nobody enters after a downed worker without air — are the difference between a scare and a funeral.

Shared blamelessly, because that is the only way anyone learns from it.

A wastewater crew at a food plant gets a call: a lift-station pump is clogged, the floats are not tripping, product is backing up. Two techs pop the hatch on the below-grade wet well. It is the middle of a shift, the line is down, and everyone upstairs is asking when it will be running. The lead grabs the four-gas meter off the truck — and the battery is dead. He knows the well “usually reads fine,” and he can see the pump from the ladder, so he starts down to clear it by hand while his partner goes to find a charged meter. Halfway down the ladder he gets a headache and a weird metallic taste and — this is the whole story — he climbs back up instead of pushing through it. His partner comes back with a working meter, they lower it in, and the H2S reading is deep into knockdown territory. Decaying food solids had been quietly gassing that well for hours.

Here is the HOP read, and it matters. Nobody was reckless. The well “usually reads fine” — that is context, and context drives behavior; his brain filed this as routine because it had been routine a hundred times. The dead battery was not sabotage, it was a defense that had quietly failed with nobody noticing. What saved him was not a rule and it was not heroics — it was a body that threw a warning and a person who honored it instead of overriding it, plus a partner who had gone for the right tool. The lesson is not “try harder.” It is: build the system so the meter is charged and bump-tested before the truck rolls, and so “the pump is down and everyone is waiting” never becomes a reason to skip the air check. The person closest to the work felt the hazard first. Good thing he listened.

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Before anyone’s body goes below grade or into a tank, vault, pit, or pump room today: turn the gas monitor on at the surface, confirm it is bump-tested, and lower it into the space on its cord before a single boot follows. Let the air tell you the truth first. And settle it out loud with your crew now, while it is calm — not at the edge of the hole while someone is down: if a worker collapses in a confined space, nobody enters after them without air supply and a retrieval line, and the first move is to call for rescue. The men in that Colorado pump room did not die because they did not care. They died because they cared enough to go in. Give your people a plan that honors the instinct without spending their lives on it.

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Please stay Safe & Hydrated!!!