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. Removes obstructions from marine railway or launching ways with pneumatic and power hand tools.
Levels rails by driving wedges beneath track with maul or sledge hammer.
Removes launching cradles and sliding ways from keels of newly launched vessels, using power and hand tools. Places rigging around sunken objects and hooks rigging to crane lines. Rigs explosives for underwater demolitions. Searches for lost, missing, or sunken objects, such as bodies, torpedoes, sunken vessels, and equipment. Places recording instruments below surface of water preparatory to underwater tests or experiments.