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📋 Toolbox Talk · Health & Safety

Confined Spaces:
The Rescue Kills Too

Confined Spaces Regulations 1997 — what counts, why you must not enter without a safe system, and why more rescuers die than workers.

✅ Verified August 2026📚 HSE · Confined Spaces Regs 1997🇬🇧 Applies across the UKukworkrights.co.uk

The risk

What counts as a confined space

A confined space is any place that is substantially enclosed where there is a reasonably foreseeable specified risk
It does not have to be small or hard to get into — large tanks, silos and vessels count
Everyday examples people miss: manholes, sewers, ductwork, pits, chambers, unventilated basements, grain silos and even open-topped tanks
The specified risks are fire or explosion, loss of consciousness from fumes or gas, drowning, asphyxiation from free-flowing solids, and heat
The atmosphere can be lethal and completely undetectable — oxygen depletion has no smell, taste or warning
Hydrogen sulphide deadens the sense of smell at dangerous concentrations, so 'it smells fine now' means nothing

⚠ Rescuers are often the ones who die

A large proportion of confined space deaths are people who went in to help. If a colleague collapses inside, do not enter. Raise the alarm and use the planned rescue arrangements.

The law

Avoid entry, then control it

The first duty is to avoid entry altogether if the work can reasonably be done another way — remote inspection, cameras, emptying from outside
If entry is unavoidable, there must be a safe system of work, followed in practice, not just written down
That system will normally require a permit to work, atmospheric testing, forced ventilation, continuous monitoring and a person stationed outside
Adequate emergency arrangements must be in place before entry begins — this is a legal requirement, not good practice
Rescue arrangements must not rely on the fire service arriving in time
Only trained, competent and authorised people may enter
Equipment must be suitable and, where flammable atmospheres are possible, intrinsically safe

A permit is a control, not paperwork

A permit to work exists to force someone competent to check the atmosphere, the isolation, the rescue plan and the communications before anyone goes in. Signing it without doing those checks defeats the point entirely.

Your rights

What you can insist on

To be trained and competent before being asked to enter — including in the emergency arrangements
To see the safe system of work and the permit covering the entry
To have the atmosphere tested before and monitored during entry
To have a top man stationed outside with the means to raise the alarm
To refuse entry where you reasonably believe there is serious and imminent danger — Employment Rights Act 1996 s.44 and s.100
Agency and self-employed workers are covered by the same duties as directly employed staff

If in doubt, stay out

No job in a confined space is urgent enough to justify entering without testing, ventilation and a rescue plan. Raising the alarm from outside is always the right call.

Common questions

Frequently asked questions

Is a manhole always a confined space?

Not automatically — but very often yes. The test is whether the place is substantially enclosed and whether a specified risk is reasonably foreseeable, such as gas, oxygen depletion or drowning. Most sewer and drainage chambers meet that test and must be treated as confined spaces.

Can I be asked to enter a confined space without training?

No. The Confined Spaces Regulations 1997 require entry to be carried out under a safe system of work by competent people, with emergency arrangements in place first. If you have not been trained in the system and the rescue plan, you should not be entering.

What should I do if someone collapses inside?

Do not enter. Raise the alarm immediately and use the planned rescue arrangements. A high proportion of confined space fatalities are untrained rescuers who were overcome by the same atmosphere within seconds.

For whoever runs this talk

Delivery notes & attendance record

Suggested length: 10–15 minutes. A toolbox talk is a short briefing on one hazard, given by a supervisor to the crew doing the work.

Before you start

The single most important message is that untrained rescue attempts kill. Historically a large share of confined space deaths are would-be rescuers. Make sure everyone knows that the answer to a collapsed colleague is to raise the alarm, not to climb in.

Questions to ask the team

Which spaces on our site would count as confined — including ones that don't look like it?
If someone collapsed inside, what exactly would you do in the first sixty seconds?
Who here is trained and authorised to enter a confined space?
Do we have a written safe system of work and rescue arrangements for that entry?

The law behind this talk

Confined Spaces Regulations 1997 (regs. 4 and 5 — avoid entry, safe system of work, emergency arrangements); Health and Safety at Work etc. Act 1974 s.2

Employers must give workers comprehensible information, instruction and training on the risks they face — Health and Safety at Work etc. Act 1974 s.2(2)(c) and Management of Health and Safety at Work Regulations 1999 reg. 10. Keep the record below as evidence that you did.

Attendance record

Topic	Confined Spaces: The Rescue Kills Too
Date
Site / location
Delivered by
Actions agreed
Next talk due

Attendees

Name	Signature

Use the Print handout button to print this record. General guidance only, not legal advice.

Free H&S guidance

Confined Spaces
free guidance

Get plain-English guidance on your rights and your employer's legal duties.

HSE Infoline

0300 003 1747

hse.gov.uk

ACAS

0300 123 1100

acas.org.uk

Citizens Advice

0800 144 8848

citizensadvice.org.uk

UK Work Rights

Confined Spaces

ukworkrights.co.uk/toolbox-confinedspaces.html

Confined Spaces:The Rescue Kills Too