§ 1910.422 Procedures during dive. ( a ) *General.* The employer shall comply with the following requirements which are applicable to each diving operation unless otherwise specified.
( b ) *Water entry and exit.* ( 1 ) A means capable of supporting the diver shall be provided for entering and exiting the water.
( 2 ) The means provided for exiting the water shall extend below the water surface.
( 3 ) A means shall be provided to assist an injured diver from the water or into a bell.
( c ) *Communications.* ( 1 ) An operational two-way voice communication system shall be used between: ( i ) Each surface-supplied air or mixed-gas diver and a dive team member at the dive location or bell (when provided or required); and
( ii ) The bell and the dive location.
( 2 ) An operational, two-way communication system shall be available at the dive location to obtain emergency assistance.
( d ) *Decompression tables.* Decompression, repetitive, and no-decompression tables (as appropriate) shall be at the dive location.
( e ) *Dive profiles.* A depth-time profile, including when appropriate any breathing gas changes, shall be maintained for each diver during the dive including decompression.
( f ) *Hand-held power tools and equipment.* ( 1 ) Hand-held electrical tools and equipment shall be de-energized before being placed into or retrieved from the water.
( 2 ) Hand-held power tools shall not be supplied with power from the dive location until requested by the diver.
( g ) *Welding and burning.* ( 1 ) A current supply switch to interrupt the current flow to the welding or burning electrode shall be: ( i ) Tended by a dive team member in voice communication with the diver performing the welding or burning; and
( ii ) Kept in the open position except when the diver is welding or burning.
( 2 ) The welding machine frame shall be grounded.
( 3 ) Welding and burning cables, electrode holders, and connections shall be capable of carrying the maximum current required by the work, and shall be properly insulated.
( 4 ) Insulated gloves shall be provided to divers performing welding and burning operations.
( 5 ) Prior to welding or burning on closed compartments, structures or pipes, which contain a flammable vapor or in which a flammable vapor may be generated by the work, they shall be vented, flooded, or purged with a mixture of gases which will not support combustion.
( h ) *Explosives.* ( 1 ) Employers shall transport, store, and use explosives in accordance with this section and the applicable provisions of §§ 1910.109 and 1926.912 of Title 29 of the Code of Federal Regulations.
( 2 ) Electrical continuity of explosive circuits shall not be tested until the diver is out of the water.
( 3 ) Explosives shall not be detonated while the diver is in the water.
( i ) *Termination of dive.* The working interval of a dive shall be terminated when: ( 1 ) A diver requests termination;
( 2 ) A diver fails to respond correctly to communications or signals from a dive team member;
( 3 ) Communications are lost and can not be quickly re-established between the diver and a dive team member at the dive location, and between the designated person-in-charge and the person controlling the vessel in liveboating operations; or
( 4 ) A diver begins to use diver-carried reserve breathing gas or the dive-location reserve breathing gas.