Confined spaces — tanks, silos, pits, wet wells, pipelines, reservoirs and vessels — kill workers in Australia every year, and inspection is one of the highest-risk activities carried out in them. Confined space inspection mistakes are not just costly; they are potentially fatal. The atmosphere can be oxygen-deficient, toxic or explosive with no warning; access is restricted; and rescue is difficult. WHS legislation and AS 2865 set clear duties for confined space work, yet shortcuts are still taken every day by owners under pressure to inspect an asset quickly and cheaply.
The central danger is that confined spaces do not look dangerous. A tank that has been open, a pit that felt fine yesterday, a silo that seems empty — all can hold an atmosphere that renders a person unconscious in a breath or two. Most confined space fatalities involve would-be rescuers who rushed in after a collapsed colleague. Assuming a space is safe, entering without a permit and proper controls, or skipping the atmospheric testing that AS 2865 requires turns a routine inspection into a multiple-fatality event.
This guide covers the confined space and tank inspection mistakes we see across Australian industry, utilities, agriculture and councils, the consequences under WHS law and in human terms, and how a professional approach — including remote and ROV inspection that avoids entry altogether — protects your people. When it comes to confined spaces, the safest inspection is very often the one where nobody goes inside.
A worker needs to 'just have a quick look' inside a tank, pit or vessel, so they climb in without a confined space entry permit, risk assessment or the controls AS 2865 requires. It feels disproportionate to run the full permit process for a two-minute look, so the process gets skipped under time pressure.
What it costs you
Unpermitted entry is behind many Australian confined space fatalities. Without a permit, hazards are not identified, controls are not in place, and there is no isolation, monitoring or rescue arrangement. A 'quick look' becomes a fatality — and a serious WHS prosecution for the PCBU that allowed it.
The professional approach
Professionals treat every confined space entry as a permit-controlled activity under AS 2865 and WHS law — with documented risk assessment, isolation, atmospheric testing, monitoring, standby and rescue arrangements. No entry occurs without the full permit process, no matter how brief the intended task.
The space was open, or someone was in it recently, or it 'smells fine', so people assume the atmosphere is breathable and skip gas testing. Confined space atmospheres are invisible and change without warning — oxygen can be displaced, and toxic or flammable gases can accumulate from residues, biological activity or adjacent processes.
What it costs you
Oxygen-deficient, toxic or explosive atmospheres incapacitate or kill in seconds, with no warning to the victim. Because the danger is undetectable to the senses, the first sign of a problem is often a collapsed worker — followed by would-be rescuers who become victims themselves.
The professional approach
Professionals test the atmosphere before entry and continuously monitor it throughout, using calibrated multi-gas detectors for oxygen, flammable gases and relevant toxics. Ventilation and controls are applied as required, and entry is prohibited unless and until the atmosphere is verified and maintained within safe limits.
Owners default to sending a person in because 'that's how you inspect a tank'. They do not consider that remotely operated vehicles, crawlers, pole cameras, drones and other remote tools can inspect many confined spaces without any human entry at all. The manned-entry mindset persists even where technology has removed the need.
What it costs you
Every avoidable entry needlessly exposes a person to the highest-consequence hazard in the workplace. Manned entry also demands ventilation, standby, rescue teams and often taking the asset out of service — slower and more costly than a remote inspection that carries none of the atmospheric or entrapment risk.
The professional approach
Professionals assess whether the space can be inspected without entry, deploying ROVs, crawlers, drones and remote camera systems for tanks, reservoirs, pipelines and vessels. No-entry inspection eliminates the atmospheric and entrapment risk entirely, often while the asset stays in service — the safest and frequently the most efficient option.
Once inside — or once a remote tool is deployed — the inspection covers the easy, well-lit, reachable areas and skips the rest: the floor under residue, the roof, behind internals, the far end of a long vessel. Because staying longer in a confined space is itself hazardous, there is pressure to look quickly and get out.
What it costs you
The corrosion, cracking, pitting or coating failure that matters most is often in the hardest-to-reach spot. Incomplete coverage means a tank can be passed as sound while a corroded floor or a cracked weld goes unseen — leading to leaks, contamination or structural failure later.
The professional approach
Professionals plan full internal coverage in advance and use ROV/crawler systems and lighting to reach every surface — floor, roof, internals and extremities — without extending human exposure. Coverage is documented so the client can see exactly what was and was not inspected, with nothing quietly left out.
Inlets, agitators, augers, heating and connected process lines are left live or inadequately isolated during inspection, on the assumption that 'nothing will start up' during the short time someone is inside. Lockout/tagout is treated as a formality rather than a life-safety control.
What it costs you
Stored energy, an inrush of liquid or gas, or a mechanical device starting up can crush, engulf or drown an inspector in an instant. Engulfment in silos and inrush in vessels are recurring causes of Australian confined space deaths, and inadequate isolation is almost always a root cause.
The professional approach
Professionals fully isolate all energy sources and connected services — mechanical, electrical, hydraulic and process flows — with verified lockout/tagout and physical blanking before any entry or inspection. Isolation is confirmed and documented as part of the permit, so no live hazard remains during the work.
An inspector enters while a colleague 'keeps an eye out' with no training, no communications plan and no equipped rescue arrangement. The assumption is that if something goes wrong, they will pull the person out or call for help. Rescue is treated as an afterthought rather than a pre-planned, resourced control.
What it costs you
Most confined space deaths include untrained rescuers who entered to help and were overcome by the same atmosphere. Without a proper standby and rescue plan, a single incident cascades into multiple casualties, and by the time emergency services arrive it is too late.
The professional approach
Professionals provide a trained standby person maintaining continuous communication and monitoring, plus an equipped, practised rescue plan appropriate to the space — before anyone enters. Non-entry rescue is prioritised, and the whole arrangement forms part of the documented permit so help is immediate and safe.
The inspection proceeds without confirming what the tank, vessel or pit has held, what residues remain, and what its process history is. People assume a 'cleaned' tank is safe or that a stormwater pit holds only water, without checking prior contents or connected sources.
What it costs you
Residues off-gas, react or remain toxic long after a space appears empty; agricultural silos and effluent pits generate lethal gases; and industrial vessels retain hazardous residues in scale and sludge. Not knowing the history means not knowing the hazard — and testing for the wrong gases can give false reassurance.
The professional approach
Professionals review the asset's contents, cleaning and process history before planning the inspection, tailoring atmospheric testing, PPE and controls to the specific hazards likely to be present. The inspection is designed around the actual substances and residues involved, not a generic assumption of 'empty and safe'.
Attention focuses on the atmosphere while the physical structure is taken for granted. A corroded tank floor, unstable stored material in a silo, or degraded internals are not assessed for the risk they pose to the inspector's own weight and presence during the inspection.
What it costs you
A corroded floor can give way, stored bulk material can collapse and engulf, and degraded internals can fall. Engulfment and structural collapse are among the deadliest confined space hazards, burying or trapping a worker faster than any rescue can respond.
The professional approach
Professionals assess structural and engulfment risk as part of entry planning — evaluating floor and wall integrity, stored-material stability and internal condition — and favour no-entry remote inspection where collapse or engulfment risk is significant. Physical hazards are controlled alongside atmospheric ones, not ignored.
The confined space is inspected but the findings — and the safety process that produced them — are captured loosely or not at all. Because the priority was getting in and out safely, the record-keeping is treated as secondary and done from memory afterwards.
What it costs you
Without documented atmospheric readings, coverage and defect findings, condition data cannot be trended and integrity decisions rest on recollection. And without a documented permit and safe system of work, the owner has little defence in a WHS investigation should an incident occur.
The professional approach
Professionals document both the safety process — permit, atmospheric readings, isolation and rescue arrangements — and the technical findings, with imagery, defect locations and coverage. This gives owners defensible WHS evidence and trendable integrity data from every inspection, whether by entry or remote means.
Why engage a professional
Confined space inspection is genuinely life-threatening work, and it is governed by strict duties under WHS legislation and AS 2865. A professional inspection provider treats every entry as a permit-controlled activity — with documented risk assessment, verified isolation, continuous atmospheric monitoring, a trained standby person and a practised rescue plan in place before anyone goes near the opening. That disciplined, standards-based process is precisely what prevents the entry, atmosphere and rescue failures behind most confined space fatalities.
The greatest safety advantage professionals bring, though, is often the ability to inspect without entering at all. Using ROVs, crawlers, drones and remote camera systems, qualified inspectors can assess the inside of tanks, reservoirs, pipelines, silos and vessels while people stay safely outside — frequently with the asset still in service. When no-entry inspection is possible, it eliminates the atmospheric, engulfment and entrapment hazards entirely, which is why it is so often the smarter as well as the safer choice.
Professionals also deliver what a rushed in-house look never can: full documented coverage of the internal surfaces, non-destructive testing of walls and floors where integrity is in question, and defensible records of both the findings and the safety process. That combination protects your people, gives you trendable condition data for integrity decisions, and provides the WHS evidence every asset owner needs if an inspection of a high-risk space is ever scrutinised.