Descends into water with aid of Diver Helper, and communicates with surface by signal line or telephone. Inspects docks, and bottoms and propellers of ships.
Repairs vessels below waterline, replacing missing or leaking rivets with bolts.
Calks leaks in ships or caissons. Guides placement of pilings for structures, such as docks, bridges, cofferdams, and oil drilling platforms. Lays, inspects, and repairs underwater pipelines, cables, and sewers, using hand tools. Cuts and welds steel, using oxyacetylene cutting torch and arc-welding equipment, utilizing air balloon device for working underwater. Cleans debris from intake and discharge strainers.