1910.424—SCUBA diving.
(a) General.
Employers engaged in SCUBA diving shall comply with the following requirements, unless otherwise specified.
(2)
At depths deeper than 100 fsw or outside the no-decompression limits unless a decompression chamber is ready for use;
(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.
(3)
A diver shall be stationed at the underwater point of entry when diving is conducted in enclosed or physically confining spaces.
(ii)
An independent reserve cylinder with a separate regulator or connected to the underwater breathing apparatus.
(5)
The valve of the reserve breathing gas supply shall be in the closed position prior to the dive.