(a) General. Employers engaged in diving operations involving liveboating shall comply with the following requirements.

(b) Limits. Diving operations involving liveboating shall not be conducted:   (1) With an inwater decompression time of greater than 120 minutes;   (2) Using surface-supplied air at depths deeper than 190 fsw, except that dives with bottom times of 30 minutes or less may be conducted to depths of 220 fsw;   (3) Using mixed gas at depths greater than 220 fsw;   (4) In rough seas which significantly inpede diver mobility or work function; or   (5) In other than daylight hours.

(c) Procedures.   (1) The propeller of the vessel shall be stopped before the diver enters or exits the water.   (2) A device shall be used which minimizes the possibility of entanglement of the diver's hose in the propeller of the vessel.   (3) Two-way voice communication between the designated person-in- charge and the person controlling the vessel shall be available while the diver is in the water.   (4) A standby diver shall be available while a diver is in the water.   (5) A diver-carried reserve breathing gas supply shall be carried by each diver engaged in liveboating operations.