The Coworker Who Went In After Him

The setup

A three-person waterproofing and plumbing crew is pumping out a flooded crawlspace after two days of rain and setting a new sump basin. The crawlspace is about 30 inches high, its only access a hatch on the back wall of the house. The crew lead, the tech and a helper. A gasoline-powered trash pump sits on the ground a few feet from the hatch, its suction hose running in through the opening.

At 11:05 am the tech, about 35 feet in, stops answering. The helper, at the hatch, sees the tech's work light stop moving and calls his name twice over the pump. Nothing. He drops to his knees and starts through the hatch. The lead, walking back from the truck, shouts at him to stop. He stops with his head and shoulders inside.

Everyone lived. The tech was brought out by the fire department about twenty minutes later and recovered; the helper had a headache and was checked at the hospital the same day. The case is filed as a near miss because the most likely outcome of the helper's first instinct was two people down in the crawlspace instead of one. It is told in the order the crew had to work it: stop the second entry, contain the hazard from outside, call it in so the right responders came, and only afterward work out why a crawlspace that tested clean at 10:15 had a man unconscious in it at 11:05.

This is not training, and nothing here teaches entry or rescue. Hands-on first aid and CPR certification is what makes a responder; confined-space rescue is a separate, equipped discipline.

Why the helper was stopped, and why that was the right call

The helper's move is the most natural thing a person does, and it is the single most dangerous one in this kind of event. NIOSH investigations of confined-space deaths have long found that a large share of the dead are would-be rescuers, often a coworker who went in after the first victim and was overcome by the same thing. The library's card on this owns the full argument (see related: Rescuing Without Becoming the Second Victim). Here it came down to one observation.

The lead wears a single-gas carbon monoxide (CO) monitor on his belt, a habit from years of furnace work. As he came around the corner of the house toward the hatch, it alarmed. The shop sets those monitors to alarm at 35 parts per million (ppm), the same default its crawlspace entry check uses. He was standing in open air beside the pump's exhaust, and the meter was telling him the air at the hatch was already past the alarm point.

That meant the tech's collapse had an explanation that applied to anyone who went in: the crawlspace air. A man who goes down silently in a crawlspace with no fall, no shock and no sound has, until proved otherwise, been overcome by the atmosphere, and the atmosphere is exactly as dangerous to the second person. The lead said it in words the helper could act on in one second: "Out. Back out. It's the air."

What would have changed the call. If the tech had cried out, been pinned, or been visibly in contact with something electrical, the atmosphere would not be the leading suspect, but the rule would be the same: nobody enters until the hazard is identified and controlled from outside. The meter did not create the rule. It just ended the argument faster.

Contain: work on the air, not on the person

With nobody going in, the crew had three jobs it could do from outside, and the lead split them. Each is something an untrained bystander can do without entering.

Kill the source. The lead shut the trash pump's engine off. He approached from upwind and hit the kill switch at arm's length rather than lingering over the exhaust, because the pump was the obvious CO source and he was already in its plume. He then rolled it away from the house, 20 feet downwind.

Push fresh air in. The helper set the crew's electric blower, the one they use to dry crawlspaces, at the hatch blowing in, with its intake pointed away from where the pump had been, and its cord run from a GFCI-protected outlet on the far side of the house, kept out of the standing water at the hatch. An electric fan, not another gas engine: a second combustion source at the hatch would have added to the problem. Ventilation from outside is the one thing a crew can do that actually improves the victim's chances before responders arrive, and it is safe because nobody's head goes through the opening.

Keep talking to him. The helper stayed at the hatch, outside it, calling the tech's name every minute or so and listening. At about 11:12 he heard the tech moan and move. That changed nothing about entry, but it was information for the call, and it went to the dispatcher.

The call, and what it told the responders

The lead called 911 at 11:07, once the helper was out and the pump was off. The shop's card says the caller describes the hazard as well as the injury, because the responders who come for "a man down" are not always the responders who come for "a man down in a crawlspace with bad air." He said:

"A worker collapsed in a crawlspace under a house, about 35 feet in from the hatch. We think it's carbon monoxide from a gas pump; our CO meter alarmed at the hatch. Nobody is going in. We've shut the pump off and we're blowing fresh air in with an electric fan."

He gave the street address and cross street, said the hatch was on the back wall, and sent the customer, who was home, to stand at the curb. The dispatcher asked him to confirm no one would enter and stayed on the line.

Saying "carbon monoxide" and "crawlspace" in the first sentence matters because it tells the dispatcher to send a fire company with self-contained breathing apparatus (SCBA, the air-supplied packs firefighters wear) and gas meters, not just an ambulance crew, who would themselves be at risk going in. See related: Calling 911 From a Job Site So They Find You.

The rescue was theirs

The fire engine arrived at 11:16, nine minutes after the call, with an ambulance two minutes behind. Two firefighters metered the hatch, went in on SCBA, and brought the tech out on a rescue sled at about 11:25. Paramedics took over on the lawn and gave oxygen. He was transported. The helper, who had been in the hatch for a few seconds and now had a headache, was evaluated by the paramedics and taken in as well; CO exposure symptoms are vague (headache, dizziness, nausea, confusion) and can be easy to dismiss, so anyone with symptoms after a possible exposure goes to the emergency department, where blood levels can be checked.

The shop's crew did not enter, did not attempt to drag the tech out with the pump hose or a rope (an untrained line rescue from a 30-inch crawlspace turns into an entry within a minute), and did not restart the pump to "keep the water down." The tech was admitted overnight, so the office reported the in-patient admission to OSHA within the 24 hours 29 CFR 1904.39 requires, and opened the incident record that afternoon (see related: Accident and Incident Reporting SOP).

Diagnose: how a clean crawlspace filled with exhaust

The crew had done the shop's entry check at 10:15: monitor held at the hatch for two minutes at face height, oxygen 20.9 percent, 0 ppm CO, no other alarm. The crawlspace was clean when the tech went in. So the question was what changed after 10:15, and the review found three things that each had to be true.

The pump started after the test. The lead started the trash pump at about 10:40, twenty-five minutes after the atmosphere check. The check had tested the crawlspace with no engine running nearby. The pump created the hazard the check could not have seen.

The air was moving the wrong way. It was a still, damp, cool morning, with the house's furnace running. A warm house tends to draw air upward from below (the stack effect), and with the crawlspace vents shut for the season, the open hatch became one of the main ways outside air got under the house. The pump's exhaust was sitting a few feet from that intake. CO weighs about the same as air, so it does not sink or rise on its own; it goes wherever the air goes, and that morning the air went into the crawlspace.

The monitor was not on the tech. The shop's crawlspace check says to clip the 4-gas monitor in the breathing zone for the whole entry (see related: The Crawlspace Entry Hazard Check SOP). After the 10:15 test, the tech hung it on a nail inside the hatch so it would not get soaked. It was alarming at the hatch while he was 35 feet in, behind the noise of the pump, where nobody heard it. A monitor at the hatch measures the hatch.

None of the three was a dramatic failure. Each was a reasonable shortcut on a wet job, and together they put a man under a house in an atmosphere he could not smell, with the alarm that would have warned him out of earshot.

Under OSHA's construction confined-space rule (29 CFR 1926 Subpart AA), a crawlspace can meet the definition of a confined space, and one with a hazardous atmosphere becomes a permit-required space, whose entry calls for an attendant, a rescue plan and continuous monitoring. Once the pump started, this space arguably crossed that line, and nobody noticed it happen. How the rule applies to a particular job is a question for the shop's safety consultant.

What the shop changed

• No combustion engine within 25 feet of a crawlspace or basement access, and never upwind of it. Dewatering under a house uses an electric pump, or the gas pump sits downwind at the end of a long discharge hose.
• Re-test after anything changes. Starting an engine, opening or closing vents, or a change of wind triggers a new atmosphere check before anyone stays in.
• The monitor rides on the person inside, in a waterproof pouch if it is wet, and the person at the hatch watches a second monitor.
• The person at the hatch is an attendant, not a helper. Their job is to watch and listen, call 911, ventilate from outside and keep everyone out; they never enter. The phrase the lead used, "Out. It's the air," is now the line every crew practices.

References

• NIOSH publications on confined-space fatalities and would-be rescuers, and NIOSH guidance on carbon monoxide hazards from gasoline-powered equipment.
• 29 CFR 1926 Subpart AA, confined spaces in construction; 29 CFR 1904.39, reporting in-patient hospitalizations.
• See related: Rescuing Without Becoming the Second Victim; The Crawlspace Entry Hazard Check SOP; Fainting and Collapse in Attics and Crawlspaces; Inhalation Exposure First Response.