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