Not all diving looks the same beneath the surface. The types of commercial diving range from deep-sea offshore operations to radiation-controlled nuclear environments, and each demands a unique set of skills, certifications, and equipment. Understanding the different commercial diving methods helps businesses, project managers, and safety officers select the right underwater diving services for the job.
At UESI, we’ve been delivering specialized industrial diving operations across the United States for over 35 years. This guide breaks down every major category of commercial diving so you know exactly what each involves.
What Is Commercial Diving?
Commercial diving is a professional discipline in which certified divers perform skilled underwater work in support of industrial, governmental, or scientific objectives. Unlike recreational diving, commercial diving methods are governed by strict OSHA standards, ADCI guidelines, and project-specific safety protocols.
Commercial divers may work on pipelines, power plants, bridges, vessels, nuclear facilities, or forensic recovery operations, often in low-visibility, high-current, or chemically hazardous environments. All of these require formally trained divers operating as part of a certified dive team.
8 Major Types of Commercial Diving Across the Gulf Coast
Here are the primary types of commercial diving practiced in the United States and globally:
1. Offshore Diving
Offshore diving supports the oil and gas industry through inspection, maintenance, and repair of subsea infrastructure. These divers work from vessels or platforms, often rotating on extended schedules in deep, open-ocean conditions.
Common tasks in offshore industrial diving operations include:
- Pipeline inspection and repair
- Wellhead installation and maintenance
- Jacket structure inspection
- Subsea equipment recovery
Offshore divers may use surface-supplied air (SSA), mixed gas, or saturation diving techniques depending on depth requirements.
2. Nuclear Diving
Nuclear diving is among the most specialized underwater diving services in the industry. Divers work inside spent fuel pools, reactor containment structures, and cooling water systems at nuclear power plants. Strict radiological controls, dosimetry monitoring, and specialized protective equipment are required.
UESI’s nuclear diving team holds diverse certifications, including those from the American Nuclear Society and the American Nuclear Standards Institute, and has decades of experience performing nuclear coating inspection, radiological diving, and underwater repair at licensed facilities across the U.S.
3. Inland / Civil Diving
Among the many types of commercial diving, we can also find civil diving. These operations are performed in freshwater environments: dams, rivers, reservoirs, harbors, and municipal water systems. These divers support civil engineering, infrastructure maintenance, and construction projects.
Typical inland underwater diving services include:
- Dam inspection and repair
- Bridge pier and fender system maintenance
- Intake structure cleaning and repair
- Cofferdam installation
4. Hazmat Diving
Hazmat divers are among the most highly trained commercial diving professionals. They operate in sewage systems, chemical spill sites, and industrial wastewater environments where full encapsulation suits, positive-pressure helmets, and decontamination protocols are mandatory.
This commercial diving method requires HAZWOPER certification in addition to standard dive credentials, and dive teams must have full decontamination stations on site.
5. Underwater Welding and Hyperbaric Welding
Underwater welding is one of the most critical types of commercial diving, as it supports structural repair and construction for many industries. It is performed using two primary approaches:
- Wet welding: performed directly in the water using waterproof electrodes.
- Dry/hyperbaric welding: performed inside a pressurized habitat placed around the work area for higher-quality welds.
UESI’s hyperbaric welding services comply with the AWS D3.6 standard and are used for ship and pipeline repair, as well as structural steelwork.
6. Scientific Diving
Scientific divers are researchers and scientists who collect data, samples, and visual documentation underwater. This type of underwater diving service supports marine biology, geology, archaeology, and environmental monitoring programs.
Scientific diving operations are often conducted in partnership with universities, government agencies, and environmental organizations. Divers must meet both scientific research credentials and AAUS (American Academy of Underwater Sciences) standards.
7. Media and Underwater Photography Diving
Media diving supports film production, documentary work, commercial photography, and broadcast journalism. These divers manage camera rigs, lighting systems, and recording equipment at depth, often in challenging visibility conditions.
This is a specialized segment of underwater diving services that requires strong technical diving skills combined with knowledge of camera systems and production workflows.
8. Public Safety / Police Diving
The last one among common types of commercial diving is public safety diving (also called police diving or forensic diving), which involves underwater search, evidence recovery, and victim recovery. These divers work closely with law enforcement, coroners, and emergency response teams.
Florida’s extensive waterways make these operations especially relevant in the state. Divers must follow strict chain-of-custody procedures for any recovered evidence.
Key Commercial Diving Methods by Environment
Beyond the type of work performed, commercial diving is also classified by the environment and technique used:
| Method | Typical Use | Depth Range |
| Surface-Supplied Air (SSA) | Inland, nuclear, civil work | 0–190 fsw |
| SCUBA | Scientific, media, and inspection | 0–130 fsw |
| Mixed Gas Diving | Deep offshore operations | 190–1,000+ fsw |
| Saturation Diving | Extended offshore, subsea | 600–1,800+ fsw |
Certifications Required for Commercial Divers
Regardless of the specific type of commercial diving, all commercial divers operating in the U.S. must meet OSHA 29 CFR 1910.401 standards. Additional certifications vary by specialty and may include:
- ADCI Certification: required for most commercial diving operations
- NRRPT: nuclear radiation protection technician, required for nuclear divers
- HAZWOPER 40-hour: required for hazmat diving
- AWS D3.6: underwater welding standard compliance
- AAUS: scientific diving authorization
- ERDI / PSI: public safety diver credentials
UESI’s Underwater Diving Services
UESI is a nationally recognized commercial diving contractor specializing in high-complexity industrial diving operations. Our certified dive teams deliver the following underwater diving services:
- Marine Construction: underwater structure installation and repair
- Nuclear Diving Radiological: licensed reactor and spent-fuel pool diving
- Nuclear Coating Consulting: inspection and application per NRC guidelines
- Corrosion Control: cathodic protection and coating inspection
- Hyperbaric Welding: wet and dry welding to AWS D3.6 standards
- Underwater Inspection: bridge, dam, pier, and vessel surveys
With more than 35 years of experience, UESI integrates safety, quality, and environmental responsibility into every commercial diving operation.
Ready to Dive into Your Next Project?
If you’re still deciding which of the types of commercial diving is the most appropriate for your project, contact UESI today to discuss your industrial diving needs with our expert team.
Whether you need specialized underwater inspection, marine construction, or hyperbaric welding, we bring over 35 years of experience to ensure your project is completed safely and efficiently.
Stay updated on the latest in commercial diving innovation, safety standards, and project highlights by following us on our social media channels: Facebook, LinkedIn, and YouTube. Join the conversation and see our dive teams in action!
