Nitrox, Mixed Gas and Deep Air Diving Services

Expert Deep Air Diving and Mixed Gas Diving Services

Nitrox, deep air diving and mixed gas diving are specialized approaches that allow work to be performed beyond standard stay times and depth levels – typically between 50- 300 feet below surface level. While deep air diving utilizes compressed air, and mixed gas diving uses specialized mixtures such as heliox – each allows divers to safely perform inspections, repairs, and maintenance in challenging, deep water environments. As depth increases, mixed gas systems allow divers to work deeper, stay productive, and safely complete complex underwater repairs and inspections on critical infrastructure. In shallower depths, when maximizing bottom time matters, UCC utilizes Nitrox to increase the bottom time over standard air diving.

As one of the industry’s leading commercial diving companies, UCC combines years of diving expertise with the latest technology, equipment, and training processes. Our team of skilled and certified divers, as well as experienced tenders and project supervisors, execute nitrox, deep air and mixed gas diving operations with unrivaled efficiency, accuracy, and safety.

Contact us to discuss your underwater projects and deep air diving requirements.

Advanced Nitrox, Air & Mixed Gas Diving Capabilities

Underwater Construction Corporation mixed gas diving support container with high-pressure gas cylinders on barge.
Underwater Construction Corporation mixed gas diving support container with high-pressure gas cylinders on barge.

UCC offers industry-leading technology and equipment to support inspection, maintenance, repair, and construction projects deep under the surface. With both conventional compressed air diving systems, nitrox systems and advanced mixed gas equipment, ROVs, and more, we can support even the most demanding underwater projects.

While other contractors may rely on pre-mixed gas deliveries and transported gas inventories, UCC leverages on-site mobile gas blending and nitrox systems. This equipment allows us to mix breathing gases topside directly at the project site – using nitrogen or helium, and oxygen to create precise dive mixtures as conditions require. This provides greater operational flexibility, improves diver safety, and reduces delays caused by gas supply logistics – helping our customers minimize downtime on critical infrastructure.

While breathing gas supplies are based on specific project conditions, our diving operations often utilize:

  • Compressed Air for Deep Diving at 100-190 feet
  • Enriched Air Nitrox Breathing Gas, Surface-Supplied, at 90 feet or less
  • Helium-Oxygen Breathing Gas, Surface-Supplied, at 190-300 feet

Underwater Construction Corp’s turn-key underwater inspection, maintenance, and repair capabilities can support your operations, even in applications deep under the surface. Explore our full line of commercial underwater services.

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“It has been a pleasure working for the UCC Team. HM Recompression Services values working with clients who take safety and the health of their divers seriously. Over the last few years HM has been able to assist UCC on many projects, and working closely alongside them, we quickly got a sense that the diver’s safety was their top priority. The management team has been great to work with and are always responsive and flexible when things change on a jobsite. Their superintendents and diver supervisors have that same great attitude. Having the UCC team respond when there is an emergency has always helped us to produce better outcomes for any afflicted diver, get them all the care they need, and return them to diving.”

– Haywood Thomson, RN, DMT
President, HM Recompression Services

A Culture of Safety for Nitrox and Deep Air Diving Excellence

Safety is always of critical importance in commercial nitrox, deep air and mixed gas diving, as the unique and challenging underwater conditions require meticulous adherence to safety protocols. As a company founded by divers, UCC maintains a safety-first culture that works, minimizes risk, develops skills, and adheres to rigorous, established processes that maintain quality, compliance, and results.

From weekly safety calls, internal programs focused on safety and training, as well as regional safety coordinators across our locations, UCC works to leverage the benefits of deep air diving and mixed gas diving, with the operational processes that protect our team. Learn more about our  commitment to safety.

With an all-hands commitment to safety, UCC has put in place rigorous training processes, compliance requirements, and operational commitments that work to reduce risk. Safety is our first Core Value, and our commitment to safety includes:

  • Ongoing Team Training
    • Certified Consultants in Hyperbaric Operations and Dive Medicine Training
      Nitrox and Mixed Gas Production, Safety, and Emergency Procedures
    • Chamber Operations and Emergency Treatment Tables
  • Regulatory Compliance
    • Association of Diving Contractors International
    • OSHA and USACE EM 385-1-1 Compliant
    • US Navy Dive Manual, Rev 7, Change A Compliant
Ucc equipment

Equipped for Performance & Deep Air Diving Safety

UCC is deeply committed to equipping our divers with the best commercial nitrox, deep air diving and mixed gas diving equipment available, as we recognize the critical role it plays in enhancing their safety, efficiency, and overall performance in challenging underwater environments. Among our support equipment, we offer:

  • Climate-Controlled Decompression Chamber Packages
    • 54” double lock chamber – MWP 135 psi
    • Two 5120 diving air compressors
    • Gas Manifold w/ communications
  • Nitrox Surface-Supplied System including Diesel Powered and Electric Systems in a Climate-Controlled Container
  • Launch and Recovery Systems Utilized for Heliox Diving
Deep diving air and mixed gas - dam

Expertise For Your Nitrox and Deep Air Diving Project

Since 1969, Underwater Construction Corp has helped organizations reduce downtime, improve efficiency, and maintain safety. Whether supporting ongoing inspection and maintenance programs, or responding to emergent repair requests, our nitrox, deep air diving and mixed gas diving capabilities can support your operations.

Commercial nitrox, deep air and mixed gas diving are commonly used on critical underwater infrastructure where depth, confined conditions, or extended bottom time make standard diving impractical.

Some projects that often require deep air diving or mixed gas diving services include:

  • Dams and hydroelectric plants
  • Municipal water and wastewater facilities
  • Bridges and marine structures
  • Industrial plants and cooling systems
  • Underwater pipelines and intake systems
  • Offshore and energy infrastructure
Reach Out to Discuss Your Diving Needs
Deep diving air and mixed gas
High-pressure gas cylinders with gauges used in mixed gas and deep air diving services and operations.
Helmet
Deep diving air and mixed gas
Deep diving equipment

Locations that Offer Deep Air Diving Services

Our mixed gas and deep air diving expertise serves a diverse range of industries, from nuclear power to water utilities. As a leading commercial diving company since 1969, we set the standard in safety and innovation in commercial diving and underwater construction support, and we offer seven locations throughout the United States to assist our global customers.

Connecticut
Maryland
Michigan
South Carolina
Tennessee
Texas
Wisconsin

Nitrox, Deep Air & Mixed Gas Diving FAQs

The type of commercial diving services required for a project typically depends on the project depth, the diver’s required time at depth, underwater conditions, and the complexity of the work being performed. Standard commercial diving with compressed air is often sufficient for shallow and moderate-depth projects, while deeper or more demanding operations may require deep air or mixed gas diving capabilities to maintain safety, productivity, and compliance. In depths less than 90 feet, nitrox enhances diver safety while increasing the available bottom time.

No two underwater projects are exactly the same, and factors such as depth, diver work tasks, bottom time, environmental conditions, and decompression requirements all influence the type of diving support required. In many cases, inspections and routine underwater work can be completed using standard compressed air systems. However, as depths increase, work durations become longer, or project conditions become more demanding nitrox, deep air or mixed gas diving systems may be recommended to support safe and efficient operations.

Because deep diving operations involve increased pressure, extended bottom times, and more complex safety considerations, it is important to work with a provider that has the proper equipment, technology, and training. Look for companies with advanced safety systems, decompression chambers, ROV capabilities, on-site gas mixing systems, and experienced dive personnel trained in nitrox, deep air and mixed gas procedures. UCC’s safety-first approach includes all of these capabilities to support complex deep diving projects safely and efficiently.

Commercial diving plays a critical role in maintaining essential municipal and utility infrastructure that operates below the waterline. Common applications include drinking water reservoir inspections, raw water intake maintenance, wastewater treatment facility repairs, stormwater system cleaning, pump station servicing, and underwater valve or pipeline work. Divers are often deployed to inspect, repair, or clear obstructions in submerged systems where shutdowns or dewatering are costly or not possible. In deeper or high-pressure environments – such as large intake structures or submerged tunnels – deep air or mixed gas diving may be required to ensure safe and efficient operations.

In addition to nitrox, deep air and mixed gas diving operations, UCC provides a wide range of underwater services to support infrastructure, industrial, and utility projects. These capabilities include underwater welding (including nuclear-qualified welding applications), structural inspection and condition assessment, ROV and sonar-based surveying, repairs, and replacement. UCC also supports marine construction activities such as pipeline installation, intake and discharge system replacement, dam installation, pier and pilings, and traveling water screen repair. By combining advanced diving systems with specialized teams and equipment, UCC delivers turnkey solutions that reduce downtime and support critical maintenance and construction needs across nuclear, power generation, municipal, and industrial facilities.

Leverage the UCC Advantage

If you need nitrox, deep air diving or mixed gas diving services for your underwater project, our team is ready to help. Reach out to us and let’s discuss your specific requirements.

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