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1910.401(a)(3) Alternative Requirements for Recreational Diving Instructors and Diving Guides
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The instructor or guide is using a nitrox breathing-gas mixture consisting of a high percentage of oxygen (more than 22% by volume) mixed with nitrogen;
The instructor or guide is using an open-circuit, semi-closed-circuit, or closed-circuit self-contained underwater breathing apparatus (SCUBA); and
The employer of the instructor or guide is complying with all requirements of Appendix C of this subpart.