Work below surface of water, using scuba gear 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.

Carry out non-destructive testing such as tests for cracks on the legs of oil rigs at sea. Check and maintain diving equipment such as helmets, masks, air tanks, harnesses and gauges. Communicate with workers on the surface while underwater, using signal lines or telephones. Cut and weld steel, using underwater welding equipment, jigs, and supports. Descend into water with the aid of diver helpers, using scuba gear or diving suits. Inspect and test docks, ships, bouyage systems, plant intakes and outflows, and underwater pipelines, cables, and sewers, using closed circuit television, still photography, and testing equipment. Install pilings or footings for piers and bridges. Install, inspect, clean, and repair piping and valves. Obtain information about diving tasks and environmental conditions. Operate underwater video, sonar, recording, and related equipment to investigate underwater structures or marine life. Perform activities related to underwater search and rescue, salvage, recovery, and cleanup operations. Perform offshore oil and gas exploration and extraction duties such as conducting underwater surveys and repairing and maintaining drilling rigs and platforms. Recover objects by placing rigging around sunken objects, hooking rigging to crane lines, and operating winches, derricks, or cranes to raise objects. Remove obstructions from strainers and marine railway or launching ways, using pneumatic and power hand tools. Repair ships, bridge foundations, and other structures below the water line, using caulk, bolts, and hand tools. Salvage wrecked ships and/or their cargo, using pneumatic power velocity and hydraulic tools, and explosive charges when necessary. Set or guide placement of pilings and sandbags to provide support for structures such as docks, bridges, cofferdams, and platforms. Take appropriate safety precautions, such as monitoring dive lengths and depths, and registering with authorities before diving expeditions begin. Take test samples and photographs to assess the condition of vessels and structures. Drill holes in rock, and rig explosives for underwater demolitions. Remove rubbish and pollution from the sea. Cultivate and harvest marine species, and perform routine work on fish farms. Set up dive sites for recreational instruction. Supervise and train other divers, including hobby divers.

Mechanical -- Knowledge of machines and tools, including their designs, uses, repair, and maintenance.

Operation and Control -- Controlling operations of equipment or systems. Speaking -- Talking to others to convey information effectively.

Gross Body Coordination -- The ability to coordinate the movement of your arms, legs, and torso together when the whole body is in motion. Spatial Orientation -- The ability to know your location in relation to the environment or to know where other objects are in relation to you. Stamina -- The ability to exert yourself physically over long periods of time without getting winded or out of breath. Manual Dexterity -- The ability to quickly move your hand, your hand together with your arm, or your two hands to grasp, manipulate, or assemble objects. Far Vision -- The ability to see details at a distance. Night Vision -- The ability to see under low light conditions. Information Ordering -- The ability to arrange things or actions in a certain order or pattern according to a specific rule or set of rules (e.g., patterns of numbers, letters, words, pictures, mathematical operations). Flexibility of Closure -- The ability to identify or detect a known pattern (a figure, object, word, or sound) that is hidden in other distracting material. Problem Sensitivity -- The ability to tell when something is wrong or is likely to go wrong. It does not involve solving the problem, only recognizing there is a problem. Control Precision -- The ability to quickly and repeatedly adjust the controls of a machine or a vehicle to exact positions.

Performing General Physical Activities -- Performing physical activities that require considerable use of your arms and legs and moving your whole body, such as climbing, lifting, balancing, walking, stooping, and handling of materials. Inspecting Equipment, Structures, or Material -- Inspecting equipment, structures, or materials to identify the cause of errors or other problems or defects. Repairing and Maintaining Mechanical Equipment -- Servicing, repairing, adjusting, and testing machines, devices, moving parts, and equipment that operate primarily on the basis of mechanical (not electronic) principles. Handling and Moving Objects -- Using hands and arms in handling, installing, positioning, and moving materials, and manipulating things. Controlling Machines and Processes -- Using either control mechanisms or direct physical activity to operate machines or processes (not including computers or vehicles). Identifying Objects, Actions, and Events -- Identifying information by categorizing, estimating, recognizing differences or similarities, and detecting changes in circumstances or events. Communicating with Supervisors, Peers, or Subordinates -- Providing information to supervisors, co-workers, and subordinates by telephone, in written form, e-mail, or in person. Monitor Processes, Materials, or Surroundings -- Monitoring and reviewing information from materials, events, or the environment, to detect or assess problems. Getting Information -- Observing, receiving, and otherwise obtaining information from all relevant sources.