# Commercial Divers > Work below surface of water, using surface-supplied air or scuba equipment to inspect, repair, remove, or install equipment and structures. May use a variety of power and hand tools, such as drills, sledgehammers, torches, and welding equipment. May conduct tests or experiments, rig explosives, or photograph structures or marine life. - Code: 49-9092.00 (O*NET-SOC; SOC 2018 49-9092) - Family: [Installation, Maintenance & Repair](https://foundation.org.ai/occupations#family-49), one of its 52 occupations - Tasks: 23 tasks (20 core and 3 supplemental) - Page: https://foundation.org.ai/occupations/49-9092.00 - JSON: https://foundation.org.ai/data/tasks/49-9092.00.json ## What the work is made of 1. Take appropriate safety precautions, such as monitoring dive lengths and depths and registering with authorities before diving expeditions begin. Core task · Task 13855 · Rated by 65 people who do the job, July 2015 2. Check and maintain diving equipment, such as helmets, masks, air tanks, harnesses, or gauges. Core task · Task 13856 · Rated by 63 people who do the job, July 2015 3. Communicate with workers on the surface while underwater, using signal lines or telephones. Core task · Task 13854 · Rated by 65 people who do the job, July 2015 4. Descend into water with the aid of diver helpers, using scuba gear or diving suits. Core task · Task 13857 · Rated by 65 people who do the job, July 2015 5. Obtain information about diving tasks and environmental conditions. Core task · Task 13858 · Rated by 65 people who do the job, July 2015 6. Supervise or train other divers, including hobby divers. Core task · Task 13871 · Rated by 64 people who do the job, July 2015 7. Inspect the condition of underwater steel or wood structures. Core task · Task 20809 · Rated by 63 people who do the job, July 2015 8. Inspect and test docks, ships, buoyage systems, plant intakes or outflows, or underwater pipelines, cables, or sewers, using closed circuit television, still photography, and testing equipment. Core task · Task 13859 · Rated by 65 people who do the job, July 2015 9. Repair ships, bridge foundations, or other structures below the water line, using caulk, bolts, and hand tools. Core task · Task 13860 · Rated by 64 people who do the job, July 2015 10. Recover objects by placing rigging around sunken objects, hooking rigging to crane lines, and operating winches, derricks, or cranes to raise objects. Core task · Task 13862 · Rated by 65 people who do the job, July 2015 11. Operate underwater video, sonar, recording, or related equipment to investigate underwater structures or marine life. Core task · Task 13866 · Rated by 65 people who do the job, July 2015 12. Take test samples or photographs to assess the condition of vessels or structures. Core task · Task 13864 · Rated by 65 people who do the job, July 2015 13. Cut and weld steel, using underwater welding equipment, jigs, and supports. Core task · Task 13861 · Rated by 64 people who do the job, July 2015 14. Install, inspect, clean, or repair piping or valves. Core task · Task 13865 · Rated by 65 people who do the job, July 2015 15. Carry out non-destructive testing, such as tests for cracks on the legs of oil rigs at sea. Core task · Task 13872 · Rated by 64 people who do the job, July 2015 16. Install pilings or footings for piers or bridges. Core task · Task 13863 · Rated by 64 people who do the job, July 2015 17. Salvage wrecked ships or their cargo, using pneumatic power velocity and hydraulic tools and explosive charges, when necessary. Core task · Task 13868 · Rated by 62 people who do the job, July 2015 18. Remove obstructions from strainers or marine railway or launching ways, using pneumatic or power hand tools. Core task · Task 13867 · Rated by 65 people who do the job, July 2015 19. Set or guide placement of pilings or sandbags to provide support for structures, such as docks, bridges, cofferdams, or platforms. Core task · Task 13869 · Rated by 64 people who do the job, July 2015 20. Perform activities related to underwater search and rescue, salvage, recovery, or cleanup operations. Core task · Task 13870 · Rated by 65 people who do the job, July 2015 21. Perform offshore oil or gas exploration or extraction duties, such as conducting underwater surveys or repairing and maintaining drilling rigs or platforms. Supplemental task · Task 13875 · Rated by 63 people who do the job, July 2015 22. Drill holes in rock and rig explosives for underwater demolitions. Supplemental task · Task 13873 · Rated by 64 people who do the job, July 2015 23. Remove rubbish or pollution from the sea. Supplemental task · Task 13874 · Rated by 64 people who do the job, July 2015 ## More in Installation, Maintenance & Repair - [Aircraft Mechanics and Service Technicians](https://foundation.org.ai/occupations/49-3011.00): 38 tasks - [Audiovisual Equipment Installers and Repairers](https://foundation.org.ai/occupations/49-2097.00): 11 tasks - [Automotive Body and Related Repairers](https://foundation.org.ai/occupations/49-3021.00): 25 tasks - [Automotive Glass Installers and Repairers](https://foundation.org.ai/occupations/49-3022.00): 18 tasks - [Automotive Service Technicians and Mechanics](https://foundation.org.ai/occupations/49-3023.00): 30 tasks - [Avionics Technicians](https://foundation.org.ai/occupations/49-2091.00): 13 tasks - [Bicycle Repairers](https://foundation.org.ai/occupations/49-3091.00): 14 tasks - [Bus and Truck Mechanics and Diesel Engine Specialists](https://foundation.org.ai/occupations/49-3031.00): 26 tasks - [Camera and Photographic Equipment Repairers](https://foundation.org.ai/occupations/49-9061.00): 15 tasks - 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