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.
<ul><li>Take appropriate safety precautions, such as monitoring dive lengths and depths and registering with authorities before diving expeditions begin.</li><li>Check and maintain diving equipment, such as helmets, masks, air tanks, harnesses, or gauges.</li><li>Communicate with workers on the surface while underwater, using signal lines or telephones.</li><li>Descend into water with the aid of diver helpers, using scuba gear or diving suits.</li><li>Obtain information about diving tasks and environmental conditions.</li><li>Supervise or train other divers, including hobby divers.</li><li>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.</li><li>Inspect the condition of underwater steel or wood structures.</li><li>Repair ships, bridge foundations, or other structures below the water line, using caulk, bolts, and hand tools.</li><li>Recover objects by placing rigging around sunken objects, hooking rigging to crane lines, and operating winches, derricks, or cranes to raise objects.</li><li>Operate underwater video, sonar, recording, or related equipment to investigate underwater structures or marine life.</li><li>Take test samples or photographs to assess the condition of vessels or structures.</li><li>Cut and weld steel, using underwater welding equipment, jigs, and supports.</li><li>Install, inspect, clean, or repair piping or valves.</li><li>Carry out non-destructive testing, such as tests for cracks on the legs of oil rigs at sea.</li><li>Install pilings or footings for piers or bridges.</li><li>Salvage wrecked ships or their cargo, using pneumatic power velocity and hydraulic tools and explosive charges, when necessary.</li><li>Remove obstructions from strainers or marine railway or launching ways, using pneumatic or power hand tools.</li><li>Set or guide placement of pilings or sandbags to provide support for structures, such as docks, bridges, cofferdams, or platforms.</li><li>Perform activities related to underwater search and rescue, salvage, recovery, or cleanup operations.</li></ul>