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Working with tools underwater presents special problems especially when diving with scuba gear. The near neutral buoyancy of the diver makes applying leverage and handling reaction forces difficult. When using any tool which requires leverage or force, the diver should be braced with feet, free hand, or a shoulder.

Some diver power tools are listed in NAVSEAINST 10560.2C, Diving Equipment Authorized for Navy Use (ANU). Not all tools need to be authorized for use. The basic requirement for tool-ANU applies to Category II equipment - non-life support equipment which is potentially hazardous to the diver (e.g., explosively actuated tools, surface-powered electrical tools, hydraulic chain saws, etc.). Approval is provided by the Naval Sea Systems Command, Code OOC.

Category m equipment is non-life support accessory equipment which enhances mission accomplishment but is not considered hazardous or essential to safe diving operations. This equipment is supported by the supply system and has been tested or developed by the Navy. Other nonsupply system commercial items are authorized provided they are properly maintained in accordance with the manufacturer's requirements.

CAUTION Use caution when using tools underwater that have trigger locking mechanisms. These locking mechanisms should be removed before diving, especially if the tool can produce reaction forces or present entanglement problems with the diver's personal gear.

CAUTION Do not energize tool power sources until the divers are at the work site and signal topside when they are ready to work. De-energize power to the tool when the diver is transiting between underwater work sites.

CAUTION The U.S. Navy Diving Manual requires using voice communications with the Dive Supervisor when using scuba gear with powered tools. Surface-supplied diving gear is assumed to have working communications.

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