1910.424(a) General. Employers engaged in SCUBA diving shall comply with the following requirements, unless
otherwise specified.
1910.424(b) Limits. SCUBA diving shall not be conducted:
1910.424(b)(1) At depths deeper than 130 fsw;
1910.424(b)(2) At depths deeper than 100 fsw or outside the no-decompression limits unless a decompression chamber
is ready for use;
1910.424(b)(3) Against currents exceeding one (1) knot unless line-tended; or
1910.424(b)(4) In enclosed or physically confining spaces unless line-tended.
1910.424(c) Procedures.
1910.424(c)(1) A standby diver shall be available while a diver is in the water.
1910.424(c)(2) A diver shall be line-tended from the surface, or accompanied by another diver in the water in
continuous visual contact during the diving operations.
..1910.424(c)(3)
1910.424(c)(3) A diver shall be stationed at the underwater point of entry when diving is conducted in enclosed or
physically confining spaces.
1910.424(c)(4) A diver-carried reserve breathing gas supply shall be provided for each diver consisting
of:
1910.424(c)(4)(i) A manual reserve (J valve); or
1910.424(c)(4)(ii) An independent reserve cylinder with a separate regulator or connected to the underwater
breathing apparatus.
1910.424(c)(5) The valve of the reserve breathing gas supply shall be in the closed position prior to the
dive.
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