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. May set sheet pilings for cofferdams. May drill holes in rock for blasting purposes at bottom of lake or harbor. May work in flooded mines.