46 CFR §197.346

1. (a)Each diver using SCUBA must have—
   1. (1)Self-contained underwater breathing equipment including—
      1. (i)A primary breathing gas supply with a cylinder pressure gage readable by the diver during the dive; and
      2. (ii)A diver-carried reserve breathing gas supply provided by—
         1. (A)A manual reserve (J valve); or
         2. (B)An independent reserve cylinder connected and ready for use;
   2. (2)A face mask;
   3. (3)An inflatable floatation device;
   4. (4)A weight belt capable of quick release;
   5. (5)A knife;
   6. (6)Swim fins or shoes;
   7. (7)A diving wristwatch; and
   8. (8)A depth gage.
2. (b)Each diver using a heavyweight diving outfit must—
   1. (1)Have a helmet group consisting of helmet, breastplate, and associated valves and connections;
   2. (2)Have a diving dress group consisting of a basic dress that encloses the body (except for head and hands) in a tough, waterproof cover, gloves, shoes, weight assembly, and knife;
   3. (3)Have a hose group consisting of the breathing gas hose and fittings, the control valve, the lifeline, communications cable, and a pneumofathometer; and
   4. (4)Be provided with a helmet cushion and weighted shoes.
3. (c)Each surface-supplied dive operation using a heavyweight diving outfit must have an extra breathing gas hose with attaching tools available to the standby diver.
4. (d)Each diver using a lightweight diving outfit must have—
   1. (1)A safety harness;
   2. (2)A weight assembly capable of quick release;
   3. (3)A mask group consisting of a lightweight mask and associated valves and connections;
   4. (4)A diving dress group consisting of wet or dry diving dress, gloves, shoes or fins, and knife; and
   5. (5)A hose group consisting of the breathing gas hose and fittings, the control valve, the lifeline, communications cable, and a pneumofathometer (if the breaking strength of the communications cable is at least equal to that required for the lifeline, the communications cable can serve as the lifeline).
5. (e)Each surface-supplied air dive operation within the no-decompression limits and to depths of 130 fsw or less must have a primary breathing gas supply at the dive location.
6. (f)Each surface-supplied dive operation outside the no-compression limits, deeper than 130 fsw, or using mixed-gas as a breathing mixture must have at the dive location—
   1. (1)A primary breathing gas supply; and
   2. (2)A secondary breathing gas supply.
7. (g)Each diver diving outside the no-decompression limits, deeper than 130 fsw, or using mixed-gas must have a diver-carried reserve breathing gas supply except when using a heavy-weight diving outfit or when diving in a physically confining area.