• Take appropriate safety precautions, such as monitoring dive lengths and depths and registering with authorities before diving expeditions begin.
• Check and maintain diving equipment, such as helmets, masks, air tanks, harnesses, or gauges.
• Communicate with workers on the surface while underwater, using signal lines or telephones.
• Descend into water with the aid of diver helpers, using scuba gear or diving suits.
• Obtain information about diving tasks and environmental conditions.
• Supervise or train other divers, including hobby divers.
• Inspect the condition of underwater steel or wood structures.
• 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.