Underwater work Underwater work is work done underwater, generally by divers during diving operations , but includes work done underwater by remotely operated vehicles and manned submersibles.Skills commonly used by all professional diving occupations Underwater navigation Pilotage Compass navigation Use of a guideline or jackstayUnderwater searches Circular search Pendulum search Jackstay searches Compass searches Directed search Basic ropework , knots and splices, tackle Rigging slings cargo nets and spreaders , lifting hooks and shackles Lifting bags Chain blocks , tirfors and pullersInspection , measuring and recording Hacksaws Hammers Cold chisels Pliers levers, wedges and crowbars Screwdrivers and wrenches Pipecutters and bolt cutters Skills specific to specialist occupations Erecting formwork and shuttering Concrete placement using a tremie or skip Oxy-arc cutting Underwater welding Use of pneumatic and hydraulic power tools High pressure jetting Hydraulic bolt-tensioning Fitting and maintenance of wellhead components Hull cleaning and inspection Mooring inspection and maintenance Pipeline inspection Propeller polishing Inspection and replacement of cathodic protection anodes Explosive demolition Bomb disposal Archaeological excavation Search and recovery Forensic evidence preservation Search and rescue Site surveys and mapping Biological sampling and tagging Core drilling Setting up and recovery of instrumentation Transect surveysGallery
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