A professional who services, repairs, and maintains deep submergence vehicle (small noncombatant submarine) and assists deep submergence vehicle operator in predive and postdive inspection and operation of vehicle.

• Connects high pressure air and oxygen hoses from land based equipment to vehicle.
• Services vehicle with oil and hydraulic fluid.
• Connects cables to and charges vehicle's battery.
• Inspects and replaces seals, gaskets, hoses, tubing, hydraulic motors, pumps, valves, filters, and other specified equipment and components aboard vehicle.
• Conducts detailed predive and postdive tests of mechanical, life supporting, electrical, and hydraulic systems.
• May drive vehicle and supervise subordinates.