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.

• Diver
• Scuba Diver

• 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.
• Cultivate and harvest marine species, and perform routine work on fish farms.
• 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.
• Drill holes in rock, and rig explosives for underwater demolitions.
• 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.
• Remove rubbish and pollution from the sea.
• 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.
• Set up dive sites for recreational instruction.
• Supervise and train other divers, including hobby divers.
• 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.

• adhere to safety procedures
• assemble, dismantle, or reassemble equipment or machinery
• build or repair structures in construction, repair, or manufacturing setting
• burn (cut), trim, or scarf metal objects
• charge blasting holes with explosives
• cut metal or plastic
• determine amount or kind of explosive needed to complete job
• erect machinery in marine or maritime setting
• estimate time or cost for installation, repair, or construction projects
• fabricate, assemble, or disassemble manufactured products by hand
• identify base metals for welding
• identify properties of metals for repair or fabrication activities
• inspect machinery or equipment to determine adjustments or repairs needed
• maintain or repair boat or ship hull or superstructure
• maintain repair records
• maintain welding machines or equipment
• move or fit heavy objects
• operate cameras
• operate video recorders
• perform safety inspections in industrial, manufacturing or repair setting
• position, align, or level machines, equipment, or structures
• read blueprints
• read specifications
• read work order, instructions, formulas, or processing charts
• repair or replace gas, steam, sewer, or water piping or fixtures
• select ship repair method
• set up specialized rigging
• signal directions or warnings to coworkers
• stretch, bend, straighten, shape, pound, or press metal or plastic
• understand construction specifications
• use acetylene welding/cutting torch
• use arc welding equipment
• use combination welding procedures
• use hand or power tools
• use two-way radio or mobile phone
• weld together metal parts, components, or structures