Diver

Set or guide placement of pilings or sandbags to provide support for structures such as docks, bridges, cofferdams, or platforms.

Supervise or train other divers, including hobby divers.

Communicate with workers on the surface while underwater, using signal lines or telephones.

Obtain information about diving tasks and environmental conditions.

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.

Cut and weld steel, using underwater welding equipment, jigs, and supports.

Drill holes in rock and rig explosives for underwater demolitions.

Check and maintain diving equipment, such as helmets, masks, air tanks, harnesses, or gauges.

Install pilings or footings for piers or bridges.

Remove obstructions from strainers or marine railway or launching ways, using pneumatic or power hand tools.

Operate underwater video, sonar, recording, or related equipment to investigate underwater structures or marine life.

Repair ships, bridge foundations, or other structures below the water line, using caulk, bolts, and hand tools.

Salvage wrecked ships or their cargo, using pneumatic power velocity and hydraulic tools and explosive charges, when necessary.

Inspect the condition of underwater steel or wood structures.

Take test samples or photographs to assess the condition of vessels or structures.

Recover objects by placing rigging around sunken objects, hooking rigging to crane lines, and operating winches, derricks, or cranes to raise objects.

Carry out non-destructive testing, such as tests for cracks on the legs of oil rigs at sea.

Install, inspect, clean, or repair piping or valves.

Take appropriate safety precautions, such as monitoring dive lengths and depths and registering with authorities before diving expeditions begin.