Underwater welding is a highly specialized form of welding that involves a lot of training and specialized skills. Underwater welders often fix damaged offshore pipelines and typically work on offshore oil rigs. While underwater welding can be very lucrative, it is arguably the most dangerous occupation in the country.
One study indicates that underwater welders have the highest accidental death rate of any occupation.
The Bureau of Labor Statistics does not track underwater welders as a group and does not list the accidental death rate for this occupation, but it is estimated that about 15% of underwater welders die on the job.
For comparison, loggers and fishermen, which are also very dangerous occupations, accident rates are below about 0.2%, which means that underwater welders are more than 60 times as likely drop dead on the job as a logger of fisherman, which are among the most dangerous occupations in the United States.
In this section, we will examine underwater welding hazards and the dangers associated with underwater welding, as well as precautions that underwater welders can take to protect themselves.
top 10 Underwater Welding Hazards
Underwater welders face constant risks due to operating dangerous equipment in dark places. Their injuries often lead to long-term health problems and even death.
Typical hazards of this occupation include:
1. Electricity and Water
The first danger you face underwater is electric shock. Water conducts electricity, especially when it contains salts and minerals, which means the environment around you can become energized if something goes wrong.
If there’s a fault in your equipment, damaged insulation, or incorrect switching, electricity can escape the intended circuit.
When that happens, the current may travel through the surrounding water and through you. Even with strict procedures, insulated leads, and DC current, the risk never fully disappears.
Unlike surface welding, you can’t just step back if something feels wrong. Underwater, your body may already be part of the electrical path before you realize there’s a problem.
2. Explosions Caused by Welding Underwater
One of the more unique dangers you face is explosion risk.
When you weld underwater, the intense heat of the arc splits water molecules into hydrogen and oxygen gases. These gases can become trapped around the weld site, forming invisible pockets. Hydrogen, in particular, is extremely explosive.
If those gas pockets ignite which can happen easily around a welding arc you get a powerful underwater explosion. Even small explosions can cause severe internal injuries, ruptured organs, or fatal trauma due to pressure shockwaves traveling through water far more efficiently than air.
This is a hazard that simply doesn’t exist in normal welding.
3. Drowning Is a Constant Risk
Unlike surface welding, you’re fully dependent on your life-support equipment just to stay alive.
If your air supply fails, a hose gets snagged, or equipment malfunctions, you don’t have seconds to react you may have only moments. Underwater welding is physically exhausting, and fatigue can make small problems much harder to manage.
Strong currents, entanglement hazards, limited mobility, and restricted visibility all increase the risk of panic or delayed response. Even highly trained divers are vulnerable when something goes wrong unexpectedly.
4. Decompression Sickness Can Kill You After the Job Ends
Some of the most serious dangers don’t appear until after you’ve stopped welding.
When you work underwater at depth, gases like nitrogen dissolve into your bloodstream. If you ascend too quickly or skip proper decompression stops, those gases can form bubbles inside your body. This causes decompression sickness, commonly known as “the bends.”
The bends can result in intense pain, paralysis, neurological damage, or death. What makes this especially dangerous is that symptoms may not appear immediately. You may feel fine at the surface then collapse minutes or hours later.
Even perfect welding technique can’t protect you from mistakes in ascent or decompression planning.
5. Extreme Pressure Takes a Toll on Your Body
Water pressure increases rapidly with depth. As you descend, that pressure affects your ears, sinuses, lungs, and internal organs.
Improper equalization can rupture eardrums or cause sinus injuries. Lung barotrauma can occur if pressure changes aren’t managed correctly. Over time, repeated exposure to high-pressure environments contributes to long-term health problems, including joint damage and neurological issues.
This means underwater welding doesn’t just carry short-term risk it can affect your health for life.
6. Ear, Lung, and Nose Damage
Spending a lot of time in high-pressure waters can lead to long-term ear, lung, and nose damage.
7. Hypothermia Happens Faster Than You Expect
Water pulls heat from your body far faster than air. Even in what feels like “warm” water, prolonged exposure can lead to hypothermia.
Cold reduces dexterity, slows reaction time, impairs judgment, and increases fatigue. When you’re already managing complex tasks in a dangerous environment, reduced physical and mental performance significantly raises the chance of mistakes.
Dry suits and thermal protection help, but they don’t eliminate the risk entirely especially during long dives.
8. Toxic Gases Add Another Invisible Threat
Underwater welding produces hazardous gases, including carbon monoxide and hydrogen sulfide. In confined or poorly ventilated underwater spaces, these gases can accumulate.
If toxic gases enter your breathing supply due to equipment failure or poor flow management, the consequences can be fatal. You may not realize what’s happening until you’re already incapacitated.
This adds yet another layer of risk beyond the obvious physical dangers.
9. Visibility, Currents, and Differential Pressure
Underwater visibility is often poor. Murky water, sediment disturbance, low light, and confined spaces make precise work extremely challenging. When you can’t see clearly, your chance of making a mistake goes up.
Strong currents can physically pull you off position, stress your equipment, or pin you against structures. One particularly deadly hazard is differential pressure (Delta P) where pressure differences across openings can trap or pull you into tight spaces with overwhelming force.
Delta P incidents are often fatal and extremely difficult to escape once they begin.
10. Complex Equipment Means More Failure Points
Underwater welding requires a massive amount of specialized equipment: power supplies, insulated welding leads, diving gear, air systems, communication lines, safety switches, and support crews on the surface.
Every extra system introduces another potential failure point. While strict procedures reduce risk, no system is ever completely fail-proof, especially in harsh underwater environments.
The future of underwater welding, and is it worth it?
As technology advances in robotic capabilities, advancements are also being made to protect underwater welders.
While the future cannot be predicted, with their industry moving closer to more conservation, underwater welders are responsible for maintaining some of the most critical components of many industries worldwide today.
Until robots can perform the nuanced and complex tasks of human and do it 100% accurate, underwater divers will always be needed by companies worldwide.
It is a challenging job, both mentally and physically, however, for all of the stress that it creates, it makes up for the job pride of maintaining the technologies of the world today.
In terms of working conditions and requirements, underwater welding may not be one of the best careers, but it is an amazing job for someone who wants to make a very high salary in a short period.
To put the underwater welding compensation into perspective, in the U.S, an entry-level underwater welder starts at roughly $32,000 a year and climbs to about $151,000 for the best in the field.
To avoid being a victim of a fatal accident, underwater welders need to be very aware of the hazards they work around and be sure to strictly adhere to their safety protocol prior to, and during any underwater welding project.
FAQs
What kills most underwater welders?
Electric Shock – Electrocution is the biggest threat to underwater welders.
Why do underwater welders not live long?
Explosions from gas pockets created from the formation of oxygen and hydrogen pose a big risk to underwater welders because they can be lethal. Electric Shock is the biggest threat to underwater welders which is why special waterproof equipment must be tested and then used for all underwater welding jobs.
What is the main cause of death in underwater welding?
Electric Shock – Electrocution is the biggest threat to underwater welders. Special waterproof equipment must be used for all underwater welding jobs. It is essential that all equipment be properly tested and insulated prior to use.
What are the odds of surviving underwater welding?
Industry investigations show that the underwater welding death rate has a high fatality rate estimated to be around 15%, making it 1,000 times more dangerous than working as a police officer.
Can underwater welders make 300k?
The $200-$300k per year take-home is certainly a draw. The reality is that those numbers are on the high end, for a skilled and lucky underwater welder. Since underwater welding pays by the project, not as a steady salary, it’s very inconsistent.
Why don’t underwater welders get electrocuted?
Wet welding relies on the release of gaseous bubbles around an electric arc to shield the weld and prevent any electricity being conducted through the water. This insulating layer of bubbles protects the diver but also obscures the welding area, making it harder to complete the weld correctly.