29 CFR 1910.426 - Mixed-gas diving.
HandlingregulationOrganisationUS Federal (eCFR)År2026
US federal regulation 29 CFR 1910.426 governs mixed-gas diving and requires a ready decompression chamber at the dive location, a bell beyond 220 fsw or 120 minutes inwater decompression, and a closed bell beyond 300 fsw. It also specifies procedures including tending each diver, a standby diver, primary and reserve breathing gas supplies, and inwater stages.
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